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IB Biology Past Paper Drilling (SL and HL): Four Themes, Two Papers
TUTORZONE EXAM DRILL GUIDE · IB BIOLOGY (SL/HL)
IB Biology (first assessment 2025) is 80% external: Paper 1 (1A multiple-choice plus 1B data-based questions) is 36%, Paper 2 (data-based, short-answer and extended-response) 44%, and the scientific investigation report takes 20%. Four unifying themes run through the course: unity and diversity, form and function, interaction and interdependence, continuity and change.
How many papers does IB Biology have and what are they worth?
Direct answer: under the course first assessed in 2025, external assessment is 80%: Paper 1 (1A multiple-choice plus 1B data-based) 36% and Paper 2 (data-based, short-answer and extended-response) 44%, with the internal scientific investigation at 20%. Paper 1 runs 1.5 h at SL and 2 h at HL; Paper 2 1.5 h at SL and 2.5 h at HL.
Assessment at a glance (2027)
| Component | Content | Weighting | Duration |
|---|---|---|---|
| Paper 1 · 1A multiple-choice | Combined with 1B into 36% of the subject; 1.5 h at SL and 2 h at HL | 36%（與 1B 合併） | 1.5 h SL / 2 h HL |
| Paper 1 · 1B data-based questions | Part of the same 36%; the brief states 1B consists of four syllabus-related questions addressing all themes | 36%（與 1A 合併） | Inside the Paper 1 time |
| Paper 2 · data, short-answer and extended-response | 44% of the subject, the heaviest component; 1.5 h at SL and 2.5 h at HL | 44% | 1.5 h SL / 2.5 h HL |
| Scientific investigation · internal | 20% of the subject, 10 hours recommended, report of up to 3,000 words | 20% | 10 hours |
Biology losses come from terminology more than comprehension, so time spent against the marking scheme should match time spent answering: circling the keywords you failed to produce is the most direct way to lift the mark.
What each paper is actually testing
| Paper | Drill focus | How marks are lost |
|---|---|---|
| Paper 1 · 1A multiple-choice | Drill confusable pairs: mitosis versus meiosis, diffusion versus osmosis, innate versus adaptive immunity | Answering from impression and ignoring the supplied figure or data |
| Paper 1 · 1B data-based questions | The four questions usually map one per theme, so review them theme by theme | Reading the text without the table or graph, so conclusions float free of the data |
| Paper 2 · data, short-answer and extended-response | One point per line with technical terms in short answers; structured extended responses (definition, mechanism, example) | Everyday wording instead of terms; extended responses with no example |
| Scientific investigation · internal | Keep the question answerable with a measurable biological variable: growth rate, enzyme activity, population density | Too few samples or no control, so the data cannot support a conclusion |
What are the four themes of IB Biology?
Direct answer: the brief groups the content into unity and diversity, form and function, interaction and interdependence, and continuity and change. Sorting your errors along those four lines matches how the papers are built better than textbook chapter order.
Drill order: by topic, then by year, then the mark scheme
| Step | What you do | Why |
|---|---|---|
| 1. By topic | Work through each topic, starting with the paper that allows least help (no calculator / closed book) | Exposes what is genuinely not understood |
| 2. By year | Whole papers to time, one or two a week | Trains pace, stamina and question selection |
| 3. Mark scheme | Go through the marking scheme question by question and log the scoring steps you missed | Most lost marks are written wrong, not thought wrong |
What is distinctive about Biology 1B?
Direct answer: the brief states 1B consists of four syllabus-related questions addressing all themes, so each question usually maps to one theme. Review them theme by theme rather than as one mixed set, which is how you find the theme where your data analysis is weakest.
A 12-week drilling timetable
| Week | Phase | What to do |
|---|---|---|
| Weeks 1-3 | By topic: foundation | Topic by topic, starting with the easiest marks, building habits and recall |
| Weeks 4-6 | By topic: core | 8-10 years of the same topic back to back, errors classified by topic |
| Weeks 7-8 | By topic: advanced and electives | Elective and higher-order topics, now under time pressure |
| Weeks 9-10 | By year: timed papers | One full paper a week, timed, no reference materials |
| Week 11 | Mark scheme work | Question by question against the marking scheme; list the scoring steps you omitted |
| Week 12 | Plug holes and simulate | Only the recurring errors from your log, then one full exam simulation |
Subject-specific weighting for this timetable: One timed Paper 1 (1A and 1B together) plus a Paper 2 topic block weekly, refreshing the four-theme terminology list fortnightly.
Use it properly: this is not a checklist to finish. Every week must keep time for redoing errors, or from week 9 you will be repeating the same batch.
Pacing
| Paper | Time | Suggested split |
|---|---|---|
| Paper 1 · 1A multiple-choice | SL 1.5 小時／HL 2 小時 | About 1 min per 1A item |
| Paper 1 · 1B data-based questions | 包含在卷一時間內 | About 5-8 min per question |
| Paper 2 · data, short-answer and extended-response | SL 1.5 小時／HL 2.5 小時 | About 1.2 min per mark |
| Scientific investigation · internal | 10 小時 | One stage every two weeks |
What should an extended response contain?
Direct answer: three things: a precise definition or mechanism in technical terms, a concrete example (organism, process, data) and a link to the theme, such as form and function or continuity and change. Biology marking depends on keywords, so everyday wording scores poorly even when the understanding is right.
The drilling mistakes that cost the most marks
| Mistake | What it looks like | What actually happens | Instead |
|---|---|---|---|
| Everyday wording | “Water moves across”, “the cell eats” | Marking rewards technical terms | Build a four-theme keyword list and check it after each paper |
| Ignoring the data in 1B | Reading only the text | 1B answers must be supported by the data | Read the figure and tables first, then the text, then answer |
| No example in extended responses | Definition and mechanism only | Examples and theme links are marked | Definition or mechanism, example, theme link |
The error log and the mark scheme
One page per theme, recording keywords, recurring mechanisms and the points you missed.
How many years should you drill?
The current course was first assessed in 2025 and is organised into four themes; old papers serve as topic and experimental practice.
How many years of past papers should you drill?
Direct answer: no official figure, but note the course and papers have been updated: first assessment 2025, with content reorganised into four themes and Paper 1 split into 1A and 1B. Old papers remain useful for topics and experiments, but they do not predict the current paper’s spread.
Frequently asked questions
Does Paper 2 include data questions?
Yes: the brief lists data-based, short-answer and extended-response questions for Biology Paper 2.
May the investigation use secondary data?
The brief describes the investigation as students gathering and analysing data to answer their own question; using secondary data follows teacher and official guidance.
How do HL and SL differ in content?
The brief marks some topics as HL-only; drill the topics for the level you are taking.
Official references
| Resource | What to use it for |
|---|---|
| IBO Biology subject brief (first assessment 2025) | Confirm Paper 1 36%, Paper 2 44%, the 20% investigation and the four themes |
| https://www.tutorzone.com.hk/ib%E7%94%9F%E7%89%A9hl | IB Biology course guide |
| https://www.tutorzone.com.hk/en-ib-math-aa-past-paper-drill-guide/ | IB Maths AA drilling guide |
Related: IB practice area · IB Physics guide · IB Chemistry guide
Next step: find a tutor / register as a tutor
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