GCSE Science: How to Tackle Required Practicals

What Are Required Practicals?

Required practicals (sometimes called core practicals) are a set of prescribed experiments that all GCSE Science students must complete during their course. They are then assessed in the written exams — not as a separate practical assessment.

Why Students Lose Marks on Practical Questions

Many students are surprised to find practical questions difficult in the exam. The issue is usually one of two things:

1. They completed the practical in class but did not revise it systematically afterwards
2. They understand what they did but not why each step matters

Exam questions on required practicals test procedural understanding, analysis of data, and evaluation of errors — not just the ability to follow instructions.

How to Revise Each Practical

For each required practical, know:

• The aim — what question is the experiment trying to answer?
• The variables — independent, dependent, and controlled variables
• The method — key steps, in order, and why each step is necessary
• The equipment — name, purpose, and units for measurement
• Risk assessment — key hazards and precautions
• Analysis — how to process and present results (graphs, calculations)
• Evaluation — sources of error, anomalous results, improvements

Practicals by Subject

Biology: Osmosis in plant tissue, enzyme activity, microscopy, photosynthesis investigations

Chemistry: Titration, rates of reaction, preparation of a salt, electrolysis, chromatography

Physics: I-V characteristics, specific heat capacity, forces and extension (Hooke''s law), radiation

Exam Paper Questions

Past paper questions on practicals often ask for improvements to a described method, or for identification of errors in given data. Practise these question types specifically. The skills transfer across practicals and can be applied even to unfamiliar scenarios.