Hello,
I have exactly done this aha. B for Chemistry at GCSE and continuing into A-Levels along with Psychology and Biology.
At GCSE I got a B in Chemistry and A in Biology (both OCR). I liked Biology and wanted to do another science at A-Level so I also chose Chemistry along with Psychology and Philosophy.
At my school we do OCR Chemistry and AQA Biology and Psychology (and Philosophy).
Biology was particularly challenging for me. I started to hate it throughout AS but somehow came out with an A grade. It took a lot of revision and practicing a lot of how science works questions. My tip for Bio is to really get to know the mark schemes for AQA because a lot of the questions they ask for content are similar but just in different contexts and also do all of exam pro for the units. The Biology ISA was pretty good for me I got a B for it. I thought that Biology was the most draining and boring for me to revise for.
I thought that Psychology was okay because it was literally remembering a load of studies and theories. But if you're not motivated to do this then I wouldn't recommend it. Then again it also depends if you're particularly interested in studying it.
I thought that it was my easiest AS level (though A-Levels are hard but out of my subjects it seemed the easiest to get a good grade in)
Chemistry was hard but I enjoyed revising for the exams it but I blame my ISA's for bringing my potential A grade in Chem for a B (I HATE CHEMISTRY ISA'S but maybe it's because I make stupid mistakes)
At the end of AS I received:
Psychology A
Biology A
Chemistry B
Philosophy B
I dropped Philosophy at A2 because I want to study Biomedical Science and they mostly require Bio, Chem and an additional subject so Psychology because I got an A. I dislike Biology but I'm good at it (it's quite sad). Chemistry is my favourite subject now. Psychology is in between, it's interesting for me but is a lot to revise for. Plus, A2 content is far more interesting than AS in my opinion.
I have applied for Biomedical Sciences at King's, York, Durham, Surrey and Lancaster University
I have so far received a conditional offer from King's for the grades AAB at the end of A-Level (A's in Bio and Chem)