Analysis, Conclusions and Evaluation (ACE) makes up 35% of the marks for Paper 3 — the single largest skill category, more
than Planning, and equal in weight to Manipulation and Presentation combined with room to spare. A large share of ACE
marks comes from questions asking candidates to identify a source of error and suggest an improvement. Examiners
consistently reward answers that are specific and causal, never generic. These notes gather the sources of error that recur
across the common O-Level Biology practicals, organised by topic, together with a working method for constructing
full-mark answers.
(This page is still being updated. However, the full set of notes is available in hard copy for students who sign up for any of our regular practical lessons, Crash Courses or Mock Exams.
- Topics Tested in Past O-Level Physics Paper 3 Practical Exam
- Topics Tested in Past O-Level Chemistry Paper 3 Practical Exam
- Topics Tested in Past O-Level Biology Paper 3 Practical Exam
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