Not sure what A-levels to pick

I have a dilemma about which A-levels to pick next year. Although I don't officially have to choose my A-levels until the end of August, I would prefer to plan in advance.

I'm hoping to do a degree in Biomedical Sciences (or something similar), and I've decided on Biology and Chemistry as my first two subjects. My dilemma is that I am interested in studying Psychology (which wasn't offered as a GCSE at my school, otherwise I would have taken it as a GCSE), but my parents are encouraging me to take Maths instead, since they believe it would be very useful (or possibly even necessary) for when I go to University. I don't mind Maths, and I'm relatively good at it, but I'm concerned that either the course will be too difficult, or that I won't enjoy it very much and regret not taking Psychology. The issue with taking Psychology is that I want to take it mostly for the purpose of my own enjoyment, rather than to aid my further studies/career.

The obvious solution would be to take both subjects and end up with four A-levels, but I would prefer not to do that because I've heard that taking four A-levels is very stressful and time-consuming.


There's a possibility that I could take an AS level in either Maths or Psychology during my first year (in case you didn't already know, taking an extra As level during the first year is no longer compulsory). Is it worth doing this, or should I just pick three subjects?