Sociology- Practice essays often and write essay plans for every question you can get hold of
Psychology- Revision cards with friends, mind maps, past paper questions, again lots of essay plans
Biology- Practice as many past papers as you can, keep reading over the text book throughout the year, revision cards were the most helpful for this subject!
Maths- Past paper questions- from your exam board but also solomon and international papers! Start maths past papers as early as you can!
For all subjects: If you don't understand something try to read it from as many different sources as you can e.g. if you don't understand how your textbook explains it try a video or a revision guide.
If anyone is wondering I achieved AAAB in these subjects at AS by using these revision techniques. If you want top grades make sure you start your revision early!