I wouldn't say that it limits your prospects unless you end up wanting to do a science degree. If you choose psychology, English lit and history as your A levels then I can tell you degrees people in my year went onto do. They tended to be more essay written degrees but they include law, criminology, sociology, psychology, social work, primary school teaching, nursing (this is because of psychology), anthropology, history, politics, IR and English lit. However, people who took biology in my year tended to actually use their biology a level for something. Some people went on to do psychology, biomed, biochemistry (but this needs chem anyway), biological sciences, nursing, medicine, radiology and nutrition. I know three people who took criminology in my year and these were their A levels. One took biology, maths and psychology and went to Leeds, another took biology, psychology and politics and is going to Nottingham Trent and the last one took business, psychology and history and still got offers from great unis like Durham and Birmingham so not taking biology isn't all doom and gloom.
When I first started I won't lie I struggled a lot and was getting Es and Us which was hard for me as I want from being an A grade GCSE student to failing. I say it all comes down to learning how to condense information but still keeping the important information. For me, I understood the content I was learning but it was more the application of the question, how specific the mark scheme was and I wasn't good at multiple choice as it would throw me off so I would get 8/20
For example, you have to say cell
surface membrane instead of just cell membrane in biology or you would lose the mark. The application is also hard because you'll get a question with ''suggest'' in it and go ''wait my teacher hasn't taught me this??'' but it's about applying what you know to show your scientific skills. Videos were always so helpful and past papers. The CGP book is great to have on the side to condense information you're learning but obviously don't just rely on that. I would say that biology is ten percent maths based but it's not anything hard or drastic. Also I forgot to mention you have several practicals you do during the two years called PAGs and if you were to do a science based degree it is required you pass. I would say biology is hard but it's not unbearable but like I said, it's about putting the time in. Just don't leave revision to last minute, revise as you go along and don't just treat free periods like a holiday (I'm guilty of that)
I hope this insight helped