Unit 4: one option
70 marks for the common content and 20 marks for one option: Immunology and Disease, Human Musculoskeletal Anatomy, or Neurobiology and Behaviour.
AS / UGUnits 1 + 2
A complete AS qualification. Also contributes 40% of the full A level.
A2 / U2Units 3 + 4 + 5
The remaining 60% of the full A level, building on your AS knowledge.
How your grade is built
Units, exams & weightings
The full A level column adds up to 100%. For students taking AS only, Units 1 and 2 are worth 50% each.
Unit 5: two practical tasks
Experimental Task: 2 hours, 20 marks. Practical Analysis Task: 1 hour, 30 marks. Together they make up 10% of the full A level. Practical skills also appear in written exams.
Source: WJEC specification, assessment summary (p. 3), practical examination (p. 61), and assessment weightings (p. 63). Read the specification ↗
Where would you like to go?
AS / UG
AS course map →
Units 1–2, topic overviews, personal revision checklists and practicals.
A2 / U2A2 course map →
Units 3–4, topic overviews, personal revision checklists and practicals.
PLANTeaching timeline →
See the teaching plan, revision blocks and exam dates.
EXPLOREBioLab →
Apply your biology in connected AS and A2 investigations.