Hi Smuash
In terms of A2 Biology, I would make sure I leave myself plenty of time to fully learn and understand the content and to make link between different module ofems biology. Same for A2 chemisty.
In terms of Psychology, I would make sure that I really memorise those content, I would definitely learn it after each lessons, so it allow you to do it in successive steps, rather than in bulks in one go....
I would also make sure you know how to deploy IDAs effectively as part of your evaluations (as the save lots of time) and that you can write fully-developed evaluations points that will get you high mark in exams.
I would also write some model essays for your teacher to marks and then you can just reproduce something similar in the exam. --Marvel