There are five mandatory units:

• Unit 1: Key concepts in science – externally assessed via a written exam.

• Unit 2: Applied experimental techniques – internally assessed coursework.

• Unit 3: Science in the modern world – externally assessed via a written exam with pre-released material.

• Unit 4: The human body – externally assessed via a written exam.

• Unit 5: Investigating science – internally assessed via the creation of a portfolio.

Plus one optional internally assessed unit which will be either microbiology, medical physics or organic chemistry.