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For example, you could revise for an hour before taking a 20-minute break. Any structure is good as long as you know that you are getting somewhere with your revision. Remember that your future partly depends on how well you do in your GCSEs. You have a very long summer to look forward to; there is no excuse to not put your mind to revision now. Make sure that you have all of your books and textbooks for each subject. If you can't find them, look to the other points.
Be sure to put yourself in the right mind to revise. Set limits to all distractions including your TV, computer, game consoles, and mobile phone. Gather all of your notes together. Write a list of all the exams you have and the dates next to them. Write a list of all the topics that you need to revise.