I did Biology and it was difficult. The content was understandable but the exam questions required a lot of application. Friends who did Chemistry think Bio is harder than Chem. Majority who did physics dropped the subject after second year (we have to do 4 subjects in first year in our school). It is a lot of content, be prepared. I underestimated A-Levels, I heard it was hard but I did not expect to be a lot of content. However, if you keep working and do pass papers and constantly revise then you will be fine.
I took English Language, Biology, History and Psychology. Dropped Bio in second year. My GCSEs were Grade 9 in History, 9 and 8 in Comb Science, 8 in maths, 7 in French, Computer science, English lit, 6 in English Lang. A* in Chinese, Distinction in Business IT, Distinction* in Catering. GCSEs are so different to A-Levels, content in A-Level is covered quickly and requires really specific terminology (in bio) to get marks. My other subjects are fine, but for the sciences it can be difficult. I enjoyed Biology and it is just a matter of trying your best and doing exam papers a lot. If you are struggling, you should ask for help from teachers. I have applied to do foundation year medicine since I do not have science subjects to study on the regular straight medicine pathway. I have received two offers and hopefully, I can start uni in September, it all depends on my results T-T