Pls need some advice

Hii I’m in Y13 and don’t know if I’m fo sure taking a gap year I wanted to ask can I apply I get AAD or AAC to psychology?? A in psych A in bio and chem i actually can’t do I got a C in as and I just can’t do it. I thought I would need to take a gap year for it. I wanted to pursue psychology and later a masters in it. Pls let me know if it’s possible to go to a good university