Official past papers and mark schemes for Edexcel International AS Level Biology (XBI11) are free from Pearson Edexcel. We link to them rather than copy them, so you always get the board's own, up-to-date files.
Look for these paper codes: WBI11/01 (Unit 1), WBI12/01 (Unit 2) and WBI13/01 (Unit 3).
Pearson says only teachers can open the most recent papers, from roughly the last year, so schools can use them as mocks. Ask your teacher if the newest series is locked. Clock it with SCI is not affiliated with Pearson Edexcel and does not host any past papers.
| Paper | Time | Marks | What it tests |
|---|---|---|---|
| Unit 1: Molecules, Diet, Transport and Health | 1 hour 30 minutes | 80 marks, 40% of the IAS | Topic 1 Molecules, Transport and Health and Topic 2 Membranes, Proteins, DNA and Gene Expression |
| Unit 2: Cells, Development, Biodiversity and Conservation | 1 hour 30 minutes | 80 marks, 40% of the IAS | Topic 3 Cell Structure, Reproduction and Development and Topic 4 Plant Structure and Function, Biodiversity and Conservation |
| Unit 3: Practical Skills in Biology I | 1 hour 20 minutes | 50 marks, 20% of the IAS | A written paper on practical skills from Units 1 and 2 (core practicals 1 to 9): planning, measurements and processing results |
From the Edexcel specification (International AS and A Level Biology specification (PDF)). Always check the latest version with your teacher before the exam.
