Here are some useful websites
https://chemrevise.org/ocr-revision-guides/https://www.ocr.org.uk/Images/171720-specification-accredited-a-level-gce-chemistry-a-h432.pdfhttps://www.physicsandmathstutor.com/chemistry-revision/a-level-ocr-a/https://mathsmadeeasy.co.uk/a-level-chemistry-revision/ocr-past-papers/Make sure to make good, readable notes (do not write small and cramped), test yourself, do lots of practice questions
Go over everything, including the stuff you think you know well. Especially go over topics you struggle on
Break down your revision into chunks
Plan your time effectively in the exam. OCR recommends that for papers 1 and 2 you spend 1.25 minutes per mark including reading. Please remember that this is only an average. That leaves about 10 mins at the end to check your answers.
Do the questions you find easy first, e.g. multiple choice and calculations, and spend more time on 6 markers, also it might be a good idea to plan your answers to 6 markers. Do not be afraid to use bullet points! Use past papers and the textbook questions. Check your answers AFTER you have done the questions, otherwise you won't learn. Don't spend all your time revising. Take breaks, reward yourself, eat well, sleep well, drink plenty of water, do not pull all-nighters before the day of your exams. 6 to 7 hours revision per day is roughly what I did e.g. do 2 hours after breakfast, 2 hours after lunch, 2 hours before dinner (in total, take breaks in between), then take the evening off or something. Do not spend 9 hours a day revising. Also make sure to get outside for some fresh air and exercise. It'll be a good break from revision.t