AS & A Level Options

Those are very academic subjects, but if you're willing to work and are 100% sure you want to take medicine, then go right ahead. Personally, I might think about swapping Physics for something like History or another humanity just to have a broader range and thus more choice. But that's just me, and if you like Physics, then that's fine.

You're probably going to be looking at taking the reformed A-Levels rather than AS but your choices are spot on. They are all tough subjects but necessary of you want to study Medicine.

I'm currently in Year 12, am taking Biology, Chemistry, Maths, and Physics, and am interested in studying something in the medicine area at university too, so I guess my viewpoint might be helpful!

I won't sugar-coat it: it's a hard combination of subjects, but if you are interested in them you will do well. I would recommend that you start watching the Biology, Chemistry, and Physics courses on CrashCourse, and read up on some of the more complicated topics around the subjects (Quantum Mechanics, Particle Physics, Relativity, Differential and Integral Calculus, Biochemistry, Mass Spectrometry, etc.). In the sciences you'll often hear the line "we lied to you a bit at GCSE" (particularly in Chemistry - those electrons in the nice neat shells? Look up the quantum mechanical model of the atom and you'll realise it's all lies!), so make sure that isn't a huge surprise for you.

You need to be proactive in your learning, and that means reading up in advance, following along the specification and ticking things off as you cover them in class, and making sure that you understand everything before moving on. Structure of the Heart still not clicking? Badger your teacher every lunchtime until it does. Quantum theory still just "spooky action at a distance" to you? Don't just let it slide and move on - do something about it!

Finally, don't underestimate Wikipedia. It's fantastic for getting an idea about a topic, but also for getting credible sources. Clearly you shouldn't just copy off anything - particularly not Wikipedia - but there's always a nice references section at the bottom of every page which you can look through once you've read the article. If you're a critical thinker, Wikipedia is an unparalleled source which is unmatched in both its breadth and scope!

Hopefully that helps you - feel free to PM me if you need to!