This is the most important element of your revision.
You should be checking your ability to retrieve and apply your knowledge under exam conditions. This could involve checking your definitions and key terms, completing short answer questions (SAQ's) or attempting past exam papers without notes.
You should be using approximately 30-40% of your revision time to test, check and re-test yourself; this is the best way to get ready for your exams!
Below are past exam papers which you may want to attempt.
There are more resources, including past papers and mark scheme available on the AQA website or
here.