Revision is not something that you do immediately before exams. To be effective, revision is best done as a continuous process. You could revise by turning work into a series of flow diagrams or spider diagrams.
Before the exams you will need to be organised about your revision. You should work out a revision timetable. Make a list of all the topics that have to be revised in a subject and decide in what order they should be tackled. Space out the revision for each topic. To keep up interest it is usually better to revise a variety of topics each day rather than spend all day on just one topic.
In order to revise for an exam find out all you can about it. Get hold of a copy of the syllabus:-
When you are revising, review the answers you gave to the questions in your tests:
One of the reasons ‘mock’ exams are set is so that you can learn how to take exams. If you took the same exam again would you be able to answer the question better?