There are seven HSC Biology past papers on the current syllabus, and every one of them is free on the NESA website. NESA’s Biology exam papers page lists the 2019 to 2025 exam packs under the Biology Stage 6 Syllabus (2017) and files everything older in an archive it describes as not from the current syllabus.
This page links you straight to those seven papers, then goes further. At the back of every marking guidelines document, NESA prints a Mapping Grid that tags each question with its module and content area. We added up all seven grids to show how the exam spreads its 100 marks across Modules 5 to 8, which content areas turned up every year, and what NESA’s markers said cost students marks, module by module, in our own words.
Key Takeaways
- NESA publishes each year’s HSC Biology exam paper, marking guidelines and marking feedback for free. The 2019 to 2025 papers are the ones set on the current syllabus.
- Every paper is worth 100 marks: 20 multiple-choice questions in Section I and 80 marks of short-answer and extended-response questions in Section II, in 3 hours plus 5 minutes of reading time.
- The papers spread their marks evenly. Across all 700 marks from 2019 to 2025, each module’s single-module questions took between 22% and 25%, and in 2023, 2024 and 2025 every module got 23 to 26 marks.
- Eight content areas appeared in Section II of all seven papers: reproduction, DNA and polypeptide synthesis, genetic variation, mutation, genetic technologies, causes of infectious disease, prevention, treatment and control, and epidemiology.
- A recurring marking-feedback theme is precision: name the specific example, use the exact biological term, engage with the stimulus and answer the verb the question actually uses.
- The current syllabus is examined up to and including the 2027 HSC. The first HSC on the new Biology 11–12 Syllabus (2025) is in 2028.
- Taking Chemistry too? Our HSC Chemistry past papers guide does the same analysis for that exam.
Contents
- Where to find official HSC Biology past papers
- What is in the HSC Biology exam
- Biology HSC papers by module
- HSC Biology exam trends
- What cost marks in each module
- How to use past papers
- Are older papers still useful?
Where Can You Find Official HSC Biology Past Papers (2019–2025)?
Each year’s exam pack has the paper, the marking guidelines (with sample answers and the Mapping Grid at the end) and the markers’ feedback, which sits on the exam pack page itself. Every link below goes to NESA; we don’t host copies.
| HSC year | Exam paper | Marking guidelines | Exam pack and marking feedback |
|---|---|---|---|
| 2025 | 2025 paper (PDF) | 2025 guidelines (PDF) | 2025 exam pack |
| 2024 | 2024 paper (PDF) | 2024 guidelines (PDF) | 2024 exam pack |
| 2023 | 2023 paper (PDF) | 2023 guidelines (PDF) | 2023 exam pack |
| 2022 | 2022 paper (PDF) | 2022 guidelines (PDF) | 2022 exam pack |
| 2021 | 2021 paper (PDF) | 2021 guidelines (PDF) | 2021 exam pack |
| 2020 | 2020 paper (PDF) | 2020 guidelines (PDF) | 2020 exam pack |
| 2019 | 2019 paper (PDF) | 2019 guidelines (PDF) | 2019 exam pack |
All seven papers, marking guidelines and marking feedback are © NSW Education Standards Authority. In the published 2021 and 2024 papers, a few images are replaced by a note that they can’t be shown for copyright reasons, so expect the odd gap in the stimulus. If a PDF link stops working, the Biology HSC exam papers page always lists the current exam packs.
NESA adds each year’s pack to that page after the HSC, so the 2026 paper (NESA’s 2026 timetable set the Biology exam for Wednesday 21 October 2026) will join the list once NESA publishes it. We’ll add it here when it does.
What Is in the HSC Biology Exam?
The format hasn’t changed since 2019. Every cover prints the same instructions: draw diagrams in pencil, and NESA-approved calculators may be used. Section II ran from Question 21 to somewhere between Question 32 (2020 and 2022) and Question 35 (2023 and 2024), with many questions split into parts.
Every paper had exactly two single parts worth 7 marks or more (see the big-question chart). The largest single part was 9 marks (2021 Question 33 (c)), and the largest numbered question, all parts added, was 20 marks (2019 Question 33, which ran through five parts and three modules).
Every question in the 2019 to 2025 Mapping Grids is tagged to one or more of the four Year 12 modules: Heredity (Module 5), Genetic Change (Module 6), Infectious Disease (Module 7) and Non-infectious Disease and Disorders (Module 8).
Biology HSC Papers by Module: Marks per Module, 2019–2025
We added up the marks in each year’s Mapping Grid by module. A question NESA tagged with content from more than one module is counted as “shared” rather than split, because NESA doesn’t say how those marks divide.
Source and credit: the question-to-topic mapping is NESA’s, taken from the Mapping Grids in the HSC Biology Marking Guidelines 2019–2025, © NSW Education Standards Authority. The module totals are our own tally of those grids.
What Do the 2019–2025 HSC Biology Papers Show?
Treat these as a description of past papers, not a forecast: NESA sets each paper fresh, and anything on the syllabus can be examined.
Every module, every year
All four modules were examined in Section I and Section II of every paper. Questions shared between modules appeared in 2019 (10 marks), 2020 (12) and 2022 (14), and not at all in 2021, 2023, 2024 or 2025.
How much is each module worth over seven papers?
Over all 700 marks, the four modules sit within three percentage points of each other. Module 6 moved around the most in single papers, from 16 marks in 2020 to 26 in 2023 and 2025, partly because 2020 and 2022 put Module 6 content into big shared questions.
The 2019–2025 Biology papers gave each module roughly a quarter of the marks. There is no safe module to leave until last.
The biggest parts were worth 7 to 9 marks
From 2022 to 2025, no single part was worth more than 7 marks. Five of the fourteen big parts were Module 6 and five were Module 7; none was a Module 5 question on its own, even though Module 5 always had 23 to 26 marks of single-module questions. Module 5’s marks came in smaller pieces: its biggest single part in any paper was 6 marks (2022 Question 25 and 2025 Question 27).
The two shared big parts both joined disease modules: in 2019 a question on classifying a disease as infectious or non-infectious (Modules 7 and 8), and in 2020 a question on using genetic technologies to manage disease (Modules 6, 7 and 8).
Content areas that appeared every year
Eight content areas were in Section II of all seven papers. At the other end, responses to pathogens made Section II only twice (2020 and 2023), and inheritance patterns in a population and immunity four times each. Module 8’s prevention content never appeared in Section I, but it was in Section II in five of the seven papers.
What Cost Marks in HSC Biology? Module by Module
NESA’s markers give feedback on Section II, question by question; there’s none on the multiple choice. Here are the recurring themes from 2019 to 2025 in our own words, with the years they came up. The exact comments are on each year’s exam pack page.
Across the whole paper
The general feedback repeats the same advice almost every year: read the question closely and work out what the key word asks for, plan longer answers, use precise scientific terms, and engage with the stimulus and refer to it. Most years also ask students to review their answer against what was asked. The 2019 feedback also asked students to practise applying knowledge to unfamiliar scenarios and to use ideas from across modules where they fit.
Module 5: Heredity
| Where marks went | What markers wanted |
|---|---|
| Punnett squares with no key, look-alike allele letters, or a genotype ratio where a phenotype ratio was asked for (2021, 2022, 2025) | A key, letters whose capital and lower case look different, and the phenotypic ratio stated. |
| Mixing up DNA replication with polypeptide synthesis, or transcription with translation (2021, 2022, 2024) | Each process kept separate, with the roles of mRNA (codons) and tRNA (anticodons) named. |
| Confusing chromosomes with chromatids, or comparing the outcomes of mitosis and meiosis instead of the processes (2020, 2024, 2025) | Accurate drawings of meiosis, with crossing over shown as an exchange of alleles. |
| Treating external fertilisation, or self-pollination, as asexual reproduction (2020, 2024, 2025) | Anything that makes gametes is sexual reproduction; fertilisation is internal or external. |
| Pedigree answers that call a trait "recessive" without saying autosomal or sex-linked, or don't point to specific individuals (2020, 2023, 2025) | The full inheritance pattern, justified from named individuals in the pedigree. |
Module 6: Genetic Change
| Where marks went | What markers wanted |
|---|---|
| Not distinguishing somatic from germ-line mutations and their effect on offspring (2019, 2024), or confusing them with autosomal and sex-linked inheritance (2021) | Only germ-line mutations, in the DNA of gametes, can pass to offspring. |
| Describing the stimulus ("A was replaced by T") instead of naming the mutation type (2020), or treating a point mutation as a chromosomal mutation (2022) | The type named, and a change in base sequence linked to protein shape and then function (2023). |
| Thinking fertilisation or meiosis adds alleles to a gene pool (2020); mixing up gene flow and genetic drift (2022); getting backwards whether gene flow changes the gene pool or the reverse (2025) | Mutation, gene flow and genetic drift as the processes that change a gene pool, explained as cause and effect. |
| Writing "biotechnology" generally when a specific genetic technology was asked for (2020, 2025) | A named technology (for example recombinant DNA or a named genetically modified crop) and what it does at the genetic level. |
| Skipping steps in gene cloning, transgenic organisms or cloning by nuclear transfer (2021, 2024, 2025) | Every step in order, with the precise terms (restriction enzymes, ligase, plasmid vector). |
| Not linking each biotechnology to its effect on biodiversity (2019, 2021), or describing its effect on the organism instead (2023) | Each technique linked to whether biodiversity rises, falls or is maintained. |
| Offering technologies that aren't biotechnologies, or listing benefits without saying who in society they affect and why (2024) | Two different biotechnologies with specific examples, their impacts on society, and the ethical concerns each raises. |
Module 7: Infectious Disease
| Where marks went | What markers wanted |
|---|---|
| Naming a disease when a pathogen was asked for; mixing up adaptations for entry, for transmission and for surviving inside the host (2019, 2025) | A specific pathogen and the adaptation the question named. |
| Confusing antibiotics with antibodies, using antibiotics against viruses, or saying the body becomes resistant (2020) | Antibiotics act on bacteria, and it's the bacteria that become resistant. |
| Generic prevention strategies, or treatments offered when prevention was asked for (2020, 2025) | Strategies specific to the disease in the stimulus, each linked to how it stops spread. |
| Out-of-order or blurred accounts of the immune response; treating an mRNA vaccine as the antigen (2021, 2023, 2024, 2025) | The sequence from antigen presentation through helper T cells to plasma B cells and antibodies, with memory cells and active immunity explained. |
| Classifying pathogens by what they do (2020), or as "eukaryotes" instead of the group name (2022) | Classification by structure: cellular or non-cellular, nucleus or none. |
| Microbe experiments with no inoculation, no control or unsafe steps (2022) | Agar inoculated with a pure culture, a control, repetition, and plates kept sealed after incubation. |
| Blurring prevention and treatment when weighing up a set of disease-control strategies (2021) | Prevention and treatment kept distinct, with the benefits and limitations of each strategy explained. |
| Naming a safety precaution or repetition without explaining why it matters (2024) | The safety precaution justified, and repetition linked to reliability through consistent results or reducing the influence of outliers. |
Module 8: Non-infectious Disease and Disorders
| Where marks went | What markers wanted |
|---|---|
| Homeostasis answers about the external environment, or about long-term adaptations (2019) | Detection of change in the internal environment and the response, in precise terms such as hypothalamus and vasodilation. |
| Mixing up negative and positive feedback; vague roles for insulin, glucagon, the pancreas and the liver (2020, 2021) | Each component's role in the feedback loop, tied to the data. |
| Confusing structural, behavioural and physiological adaptations, or saying an organism adapts on the spot (2023, 2024) | The right type of adaptation, with how and why it works. |
| Evaluating an epidemiological study with one point and no judgement (2021, 2022, 2023) | Several design features (sample size, control group, placebo) tied to validity and reliability, then a clear judgement. |
| Screening, genetic testing or legislation offered as an educational program; describing a campaign without its effect (2019, 2024) | A real educational program, linked to the change in behaviour and the fall in incidence. |
| Picking a technology that doesn't fit the patient's disorder, or explaining cost and access instead of how it works (2020, 2021, 2024, 2025) | The right technology for the disorder and how it works (for dialysis, diffusion of urea across a membrane). |
| Designing an epidemiological study without using the stimulus to support the design, or without saying why each feature matters (2025) | Each design feature justified in terms of reliability and validity. |
Skills questions in every module
Biology’s data and investigation questions cost marks in every year’s feedback, whatever module they sat in:
- Graphs: label both axes with units and choose an even scale (2020, 2022). Then do what the question asks. Where it wanted a trend, markers wanted a line or curve of best fit instead of joined dots, with any extrapolation shown on the graph (2020, 2022, 2024). Where it wanted the data plotted (2021), they wanted precise, separate points with a key, and no line, joined points or columns.
- Data: quote and work with specific values from the stimulus rather than restating that one number is bigger (2021, 2023, 2024).
- Investigations: explain how the dependent variable is measured, give controlled variables with amounts, and repeat trials (2019). Identify the variables from the actual experiment and describe controlled variables precisely, such as the size of the container rather than just “the container” (2023).
- Reliability, validity and accuracy are three different ideas, and markers checked that students kept them apart (2021, 2024). In 2025, markers wanted each feature of a designed study justified in terms of reliability and validity.
- Compare and evaluate: a comparison needs similarities or differences on the same feature, not two separate descriptions (2024, 2025), and an evaluation needs a clear judgement (2023, 2025).
How Should You Use HSC Biology Past Papers?
- Learn the module first. A paper is a test, not a textbook. Early in Year 12, do questions by module as you finish each one.
- Sit full papers timed, in one sitting. Three hours and five minutes, closed book, with diagrams in pencil. Stopping halfway hides the stamina and timing problems that cost marks late in Section II.
- Mark it honestly against the marking guidelines. Check each marking criterion, not just the sample answer. If a criterion asks for a link or a named example you didn’t give, you didn’t get that mark.
- Read the marking feedback for the questions you dropped. It usually names the exact mistake.
- Log every lost mark by module and content area, then revise those areas before your next paper.
Seven papers isn’t many, so don’t burn them all in September. Our founder’s story of how he hacked HSC Chemistry with past papers shows the same feedback loop in practice, in a different science.
Are Older HSC Biology Past Papers Still Useful?
Papers from 2018 and earlier sit in NESA’s Biology exam papers archive, which says they are not from the current syllabus and may contain content that differs from it or isn’t covered. Use them for extra topic practice after 2019 to 2025, and check each question against the syllabus first.
The bigger change is coming. According to NESA’s Biology 11–12 Syllabus (2025) overview, Year 11 starts the new syllabus in Term 1 2027 and Year 12 in Term 4 2027, and its first HSC examination is in 2028. That makes the 2026 and 2027 HSC the last two on the current Biology syllabus, so the analysis on this page applies to them. (Biology changes a year before Chemistry, whose new syllabus is first examined in 2029.) Students starting Year 11 in 2027 begin on the new course; our Year 11 Biology tutoring page covers that year.
HSC Biology Tutoring in Blacktown
Past papers show you where the marks go. Turning that into marks you actually earn takes explanation, practice and feedback. Our HSC Biology tutoring in Blacktown runs small classes of 1 to 5 students, taught by tutors with an average ATAR of 97.1, a few minutes from Blacktown Station. Check our pricing, or book a free trial with no obligations.
The Bottom Line
The 2019 to 2025 HSC Biology past papers are free, official and the best practice material you have. Each module took roughly a quarter of the marks, eight content areas were in Section II every year, and recurring feedback asks students for specific examples, precise terms and responses that address the question’s verb. Use the charts to see where the marks have gone, and the feedback to see how they were lost.
If this article was helpful, you should check out:
- HSC past papers by subject: NESA’s 2019 to 2025 exam packs for English Advanced, English Standard, Biology, Chemistry and Physics, and how the exams compare
- HSC Chemistry past papers 2019–2025, topic by topic
- Ultimate guide to understanding NESA scaling
- HSC subject scaling
Frequently Asked Questions
Where can I download HSC Biology past papers?
NESA publishes every HSC Biology exam paper, with its marking guidelines and marking feedback, free on its website. The table at the top of this page links directly to NESA's 2019 to 2025 exam packs, which are the papers on the current syllabus.
Which biology HSC papers match the current syllabus?
The 2019 to 2025 papers. NESA lists them under the Biology Stage 6 Syllabus (2017) and keeps 2018 and earlier papers in an archive that it says is not from the current syllabus.
Do HSC Biology past papers come with answers?
Each year's marking guidelines give the multiple-choice answers and the marking criteria for Section II, usually with a sample answer. NESA's marking feedback then describes what better responses did. They aren't full worked solutions, so if you can't see why you lost a mark, ask a teacher or tutor to go through it with you.
How many marks is each module worth in the HSC Biology exam?
NESA doesn't publish a fixed split. In the 2019 to 2025 papers, single-module questions gave each module between 16 and 29 of the 100 marks in any one paper, and between 22% and 25% of all 700 marks across the seven papers. Counting questions shared between modules at full value, each module was involved in 23 to 35 marks of any one paper.
What is the format of the HSC Biology exam?
Five minutes of reading time and three hours of working time, for 100 marks. Section I is 20 multiple-choice questions worth one mark each (about 35 minutes), and Section II is 80 marks of short-answer and extended-response questions (about 2 hours 25 minutes). Diagrams are drawn in pencil and NESA-approved calculators may be used.
When does the new HSC Biology syllabus start?
Year 11 starts the Biology 11–12 Syllabus (2025) in Term 1 2027 and Year 12 in Term 4 2027, with the first HSC exam on it in 2028. Students sitting the HSC in 2026 or 2027 are examined on the current syllabus, so the 2019 to 2025 papers stay relevant for them.
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