HELP! 3 or 4 A-levels?

HELP! I am in year 11 and have NO CLUE what to do for A-levels. I am currently predicted all 8s and 9s in GCSEs and am very hard working but have had a mixture of advice on whether to choose 3 or 4 A-levels.

My choices to pick from are:
Chemistry, Physics, Biology, Maths and Further Maths

WHAT DO I DO?! Shall I choose 3 or 4? I'd love to go to Oxbridge but I don't know what to study there and I know they only require 3 but I wouldn't know which ones to choose.

Thank you! xx

I'm also in year 11. The subjects i wanted to do were same as yours. I decided I wanna do Chemistry, Biology, Physics and Maths. I would have loved to do futher maths but I don't want to give up one of the Sciences .

Year 12 here! I would really recommend not doing 4 full A Levels - especially those choices. My friend started with those and dropped biology after a fortnight. Obviously its a lot of work so its very stressful, but also you're risking getting worse grades as you're spreading your time and effort over more subjects. I currently do further maths, maths, physics and computer science, and although its still a lot of work it's manageable and nowhere near as difficult as 4 full A Levels. I would highly recommend swapping a science for further maths, and unless you're aiming to apply for a very competitive degree (medicine, oxbridge, etc.) then any two sciences & (further) maths will let you do anything - you don't need to worry about picking the right two.

As for @Skuodas, the previous paragraph still stands. However, you also want advice on subjects. Definitely do maths, and further if you want. As for the other 2 subjects, that depends on what you enjoy. Chemistry will keep your options open for most courses, but most importantly medicine/dentistry/veterinary courses require it, so chemistry is a good choice. As for physics or biology, that really does depend on you. Pick whichever one interests you more, and if neither one does then consider careers/degrees and pick the subject that seems the most relevant. But at the end of the day, whichever you pick won't hold you back.