A good way to revise for GCSE is to practice answering questions. Past exam papers should be available from your GCSE departments. You can also order them directly from the exam boards.

There is another source of practice papers. Some exam boards publish specimen papers and marking schemes online. Print these out and try them. Strictly follow the times indicated on the paper. Mark your paper according to the marking scheme. Make sure that you go through all the questions you get wrong before you start another paper.

Don't just stick to your own exam board. Syllabuses are mostly very similar. Complete as many specimen and exam papers as you can!