HELP! Can't decide which subject to drop

I'm currently taking Maths, Chemistry, Biology, and French at A Level, but I'm thinking of dropping down to three subjects. From what I've heard, those with four subjects are not favoured over those with three, so I figured I'd rather concentrate on three and get decent grades than take four and perhaps not do as well as I could

I initially only took Biology as a A Level as I was considering either taking Medicine or Veterinary Medicine at university. I still don't want to completely rule out Veterinary Medicine, but dropping biology would mean I would have to

So my questions are basically:
• Is Biology actually necessary for any degree other than those in Medicine?
• Is Chemistry more highly regarded than Biology?
• Which three of my four subjects would be the best combination?