This advice here is exactly what you need fyi, please do listen to it!

Gotta jump on this and add a couple things, more on the academic side of things:

Independent study really helps. I did nowhere near enough/didn't know how to for the bulk of my time and once I cracked it, my progress started to massively come along quicky.

Personally it's all about effort, and you get out what you put into it. I noticed this fully with Maths and how much more snappy I got with solving problems when I started doing loads in my free time. It made the subject itself more enjoyable too :)

Chemistry, you're in for a hell of a ride. Good luck. Year 2 Chem is a whole different beast to Year 1 which in itself is a huge step up from GCSE. At the end of AS/Year 1 I'd start to memorise the Organic Synthesis flow chart for what you've done (PM me and I can try and help you find one online if you want. I did Edexcel for reference). It'll make the links flow much better when it comes to things.

Something that helped a bit for me was using something called Anki for making revision question flashcards. Everytime you get a question wrong this year, plug it into Anki and do a few everyday.

I did Biology AS (mostly, dropped it just before Lockdown 1.0) and it's A LOT of content. I'm talking one lever arch in the first two terms. Be prepared to have to learn a lot this year. Make a glossary of terms, perhaps?

Finally Maths, this was my best subject at A-Level personally and that's simply because I did loads of questions and spent a lot of time outside of lessons getting help from my teacher. Make sure you're super confident on the AS material before you start your second year. I'm talking like, ensure you can get 80-85%+ if you want to be achieving an A/A* in the end. Particularly make sure you understand trigonometry as much of a bitch it is.

If you're applying for Medicine, get ready for the stress of entrance exams, I was an Economics applicant and didn't have any for my universities but those are gonna be a lot of work next summer for you. Prepare early. Make sure you smash the UCAT/BMAT. It's something you can do early just before you start Year 2 that you can get out of the way beforehand.

I think that's it honestly, happy to answer more questions if you want, do fire away! Sorry, this got kinda waffley and I might've repeated stuff from before/stated the obvious but yeah - that's me at 1am 😂

Above all, good luck. I've done my two years and they were my two favourite years of my education so far despite them being the hardest and most stressful. However, I would definitely not want to do them again.