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Paper 1 is the highest ROI on your revision time — simple structure, no essay writing, and a clear playbook for scoring the top band.
| Section | SL | HL | Format |
|---|---|---|---|
| Paper 1A | 30 MCQ · 45 min | 40 MCQ · 1 h | 4-option MCQ, no negative marking |
| Paper 1B | 3 data Qs · 45 min | 4 data Qs · 1 h | Data analysis + short responses |
Answer every obvious question on sight. Flag anything that needs more than 60 seconds with a physical mark on the paper.
Tackle flagged questions with the remaining time. Eliminate 2 wrong options, then pick the best of the remaining two.
Read the intro text, then the question parts, then the figure — in that order. Highlight every unit on figures before reading values.
Verify your answer grid matches your chosen options. Misaligned grids are the single biggest avoidable loss on Paper 1A.
Paper 1 has two sections — Paper 1A and Paper 1B — sat back to back. Paper 1A is multiple choice: 30 questions for SL and 40 for HL, 45 minutes and 1 hour respectively. Paper 1B is data-based short response: usually 3 data-driven questions worth ~25 marks, 45 minutes for SL and 1 hour for HL. Both sections are based on Themes A–D with no options.
No. Paper 1A multiple choice questions carry 1 mark each and no mark is deducted for wrong answers. Answer every question — even blind guessing has a 25% chance of scoring.
Yes, the IB Biology data booklet is provided for both Paper 1A and Paper 1B. It contains statistical formulas, reference values, amino acid properties, and key constants. Learn what is in it before the exam so you do not waste time searching during the paper.
For SL: 90 seconds per question (45 min / 30 Q). For HL: 90 seconds per question (60 min / 40 Q). Flag-and-return is more efficient than lingering. In practice, aim for 60 seconds on familiar questions and bank the time for tougher ones.
Paper 1B is a data-based section: you are given figures, tables, or charts (often from real research papers) and answer 3–5 short-response sub-questions that require interpretation, calculation, and conclusion. It tests the same content as MCQ but in an applied, data-driven form — closer in style to Paper 2 questions.
Four traps repeat across past papers. (1) Double-negative stem ("which is NOT a feature that does not…") — rewrite it in your head. (2) Figure misreading in Paper 1B — always note units on both axes before reading values. (3) "All of the above" decoys — check each option, not just the first two plausible ones. (4) Over-reading — if a question looks simple, it usually is; do not invent complexity.
Cerebrum runs timed Paper 1 mocks with examiner feedback on exactly where you lose marks and how to reclaim them.
Book Paper 1 Mock