Well, i can only help w/biology. Make sure to go over the lesson before hand, and review after class, then again at the end of the week. Keep your notes organised by topic in order and make flashcards/mindmaps (whatever u use to revise) once you finish the topic. That way, you'll be well prepared when it comes to exams
This year's AS content consists of:
1 Biological molecules
3 Organisms exchange substances with their environment
4 Genetic information, variation and relationships between organisms
If there's any help you could offer, I'd greatly appreciate it.