Honestly some good tips I can give you which I wish I had done when I was in year 10 would be.
- Sort out the subjects that you want as soon as possible, so you can get a head start and aim towards getting into these subjects.
-Looking back now, something I wish I did when picking subjects is to pick subjects that are similar. For example if you do modern, ancient and history extension, they are all quite similar and require very similar skills. Or another example would be to do economics and business studies, as the content in each subject is actually very transferrable. Ultimately this comes down to personal preference, but in reality it makes things easier.
- When I mean get a head start, I mean begin to memorise the syllabus for topics you want and create notes. If you get a large head start on notes now, it will help you SOOOO much when you reach year 11.
-Very important thing to do would be to learn how to write quality essays. Most kids in my school including me rocked up in year 11 and even 12 still not knowing how to write a strong essay for things such as english, modern etc. You should have a look at past band 6 papers on the subjects you want to get an idea of what it takes to create a good essay in year 12.