The practical endorsement is reported separately, but practical skills are also tested in your written papers. Students often forget this until the exam.
Make a one-page sheet per practical
For each required practical, write the method, the key measurements, sources of error and how to reduce them on a single page.
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Uncertainty calculations come up every year. Practise them until they’re automatic. (Grace)
Practise data questions
Use past paper questions that give you results tables and ask for graphs, gradients and conclusions.