University of Manchester foundation year medicine

Hi, I’m currently looking at university options and just looked into medicine even though I wasn’t keen on the course before. However, University Of Manchester have specific GCSE requirements and I was wondering if that is something they are fixated on or can I still get onto the course if I get good grades in my A levels? (In GCSE’s I got grade 776555555 and am looking into retaking one or 2 of them.
I’m doing a BTEC and 2 a levels with a year of core maths.