I am in my first year and although I'm doing different A levels to you (I'm doing chemistry, biology, psychology and English language), I'm sure the general tips for A levels are similar.
1. You have to be prepared to put the effort in! A levels are tough, but you will be rewarded if you work hard.
2. Consolidate the content while it is fresh in your mind. What I mean by this is, if you learn something in, for example in maths during the day, go home and write up your notes/ complete practice questions to solidify what you have learnt.
3. Do past papers regularly! The mark schemes at A level are so specific, if you learn what the examiners want from your answers early, this will be a real benefit to you
4. If something doesn't make sense, ask while you're teacher/ class are still working on that specific topic, rather than waiting a few months and realising it doesn't make any sense later on, when you have learnt more content.
5. Enjoy yourself!
Good luck!!!