Ah ok, lets get started
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Science: definitely print off your specifications so you know exactly what you need to know and what you don't, use revision guides and make notes/mind maps/flash cards from the information in them - basically reduce what they'd fit into a page into more concise notes or onto a couple of revision cards or something's along those lines. Also do plenty of past papers to strengthen your exam technique (particularly on the dreaded QWC questions!) and check your understanding of content. You'll have to dedicate a fair bit of time to science!
Maths: past papers, past papers, past papers. You want to be cranking these out like there's no tomorrow. Go through the spec and make sure you know each topic well, and if you don't, practice them (websites like physicsandmathstutor or YouTube channels are very helpful for this!) until you're confident. Always analyse what went wrong after each past paper and strengthen your weaknesses.
English: Know. Your. Texts. Can't highlight the importance of this enough. Again past questions are important, but I found it was relatively easy to predict what questions would come up. Know about characters, themes and events for each chapter of your texts, and for poetry make sure you're prepared with good anthology notes! *just realised you'll be doing new spec so I'm not quite sure how it differs from what i sat*
Geography: know your case studies!!! Very important as a large proportion of your marks will come from this! Also make sure you know all the key definitions (flashcards are handy for this), key processes for the physical side of things are very important too. Past papers again are a must (think you're seeing a pattern here!) but learning content is more important. For case studies, tables are very handy for helping you group information together, I found it easier to recall in the exam if I'd put the information into a table when revising.
Further Maths: very similar to Maths really
French: I know this isn't really revision tips but make sure your controlled assessments are as good as possible! These make up a large chunk of your grade so you want them to be good. For listening exams, try to get yourself used to hearing the language being spoken (say radio or interviews etc) so that it's not a shock to you in the exam. Know your grammar rules so you know what to listen out for when someone's talking. Vocab learning is essential, my old German teacher told us that 7 is the optimal number of words to learn at once, I'm pretty sure you can find vocab lists once your exam boards website so just practice them every now and then (if youre not being tested on them in your lessons already). For reading its a similar idea: vocab and grammar mainly. Surprise surprise past papers are important again! They're usually quite picky with what's accepted as an answer and what's not, so the more past papers you do the more you'll get used to what they're looking for.
That's mainly it, just make sure you start revision at an appropriate time (id recommend Easter holidays or February half term if you think you'll need a bit longer), basically use a variety of revision techniques to help you learn your stuff! If you want to, trial new techniques for your mocks, and if they work then keep using them - it's what mocks are there for!
Thank you very much!!
Good luck with Year 11 and your GCSEs!