4th a-level for medicine

I'm picking my a-level options and I'd like to study medicine.
I've already decided to do chem bio and maths but I'm not sure whether I should take further maths or French as a fourth a-level.
Also, is doing a fourth a-level gonna boost my application in any way?
I really enjoy maths and am good at it so I think further maths would be interesting however I've heard people say it's a lot of work, and as for French, I'm fluent so I thought it would be an easy A* to add to my application (btw I've got no French roots and I just lived there when I was 8 months to around the age of 4 so no one would know)

I'm picking my a-level options and I'd like to study medicine.
I've already decided to do chem bio and maths but I'm not sure whether I should take further maths or French as a fourth a-level.
Also, is doing a fourth a-level gonna boost my application in any way?

I really enjoy maths and am good at it so I think further maths would be interesting however I've heard people say it's a lot of work, and as for French, I'm fluent so I thought it would be an easy A* to add to my application (btw I've got no French roots and I just lived there when I was 8 months to around the age of 4 so no one would know)

I personally am taking 4 a levels (although I want to study psychology, not medicine) and I don't see any drawbacks to it. Personally I would recommend French since you're already fluent and the workload isn't as much as in further maths so it won't eat at your time much. It's also easier than Further Maths so you can basically guarantee you'll get a good grade doing half (or even less!) of the work you'd have to do for Further Maths.
The university knowing you're fluent in French isn't really much of an issue. I'm a native Spanish speaker, born and raised in Spain (and I still live there) and my school makes all of us take Spanish A Level for an easy A* so don't worry about the university knowing about you being fluent in French.
hope this helps!!

It depends on the universities you apply to. Generally, most only consider your 3 best A-Levels. Otherwise they might give you reduced offers (e.g. AAAB vs A*AA).
Personally, unless you're really passionate about doing 4, I'd stick to 3. Gives you more time to build on other parts of your application (UCAT practice, interview prep, work experience) that universities will look at far far more.

Thing is, I go to a selective school and we have to do three a-levels with either an EPQ, core maths, further maths, or a fourth a-level, and I'm really not interested in doing EPQ as I'm not a fan of writing essays, and core maths just wouldn't so much for me since I'm taking a-level

Oh god that’s annoying - is that for just year 12? In that case, I would pick French if you know you can get an easy A* out of it and there will be no way for a uni to trace back that you have French roots! In any case, I know some schools make it mandatory to do 4 A Levels for year 12, but they don’t make it known that you can usually drop the 4th in year 13. Do you know if that’s possible if worst comes to worst?