IB Biology SL

Expect a multiple-choice paper testing breadth across the syllabus, a written paper with short-answer, data-based and extended-response questions where you choose from options, and a paper on practical skills. An internally assessed investigation is also submitted and externally moderated. Confirm the exact structure and weightings for your session on the official IB website.

The official body publishes the current paper durations, question counts and weightings, and these have changed between guide editions, so check the IB website and your school's subject guide rather than relying on second-hand figures. Your teacher will also confirm the structure in force for your cohort.

It is demanding but manageable. The difficulty comes less from volume than from precision: command terms such as explain, outline and evaluate demand different answer depths, and data questions reward careful graph reading. Students who memorise facts but cannot apply them to unfamiliar contexts tend to lose the most marks.

Retake arrangements, including which sessions are available and how internal assessment carries over, are set by the IB and vary by circumstance. Ask your school's DP coordinator early, because registration deadlines are strict, and confirm the current retake policy on the official IB website rather than assuming it stays the same.

The multiple-choice paper is taken without a calculator, so practise simple arithmetic, ratios, percentages and magnification calculations mentally. Other papers may permit a calculator, but always show your working, since method marks are often available even when the final value is wrong. Check the current rules for your session.

Follow your school's sequence, but revise in dependency order: biological molecules and cells first, then genetics, then physiology, ecology and evolution. Ecology and evolution feel easier once cell and genetic concepts are secure. Interleave past-paper questions on earlier topics so recall stays active rather than fading.

Answering the wrong command term, writing vague statements without mechanisms, ignoring units, misreading axes on graphs, and failing to link structure to function. In extended answers, students often omit named examples or skip the evaluation step. Practise marking your own answers against mark schemes to see exactly where credit is given.

Choose a topic where you can measure a continuous variable and control the main confounding factors, then pilot your method before committing. Focus on a clear research question, justified variables, sufficient repeats and honest uncertainty analysis. Keep a detailed lab notebook; moderation depends on evidence of your own planning and processing, not just a polished final report.

Build content knowledge first, then shift towards timed practice as the exam approaches. A workable pattern is to learn a topic, immediately attempt related questions, and revisit errors weekly. Data-analysis and extended-response questions deserve extra time because they test skills that reading notes alone does not develop.