I have 3 GCSEs and would rather retake them this year and spend an extra year at college rather than worry about them in future. Any advice?
I agree, GCSE's are important and if you don't have the right grades or right subjects (5 GCSE's from A-C including Maths and English Lang) then you might as well spend an extra year doing them. Because not having them in the future is a pain in the ass. Ask your sixth form if they can change your course and if they cant then enroll in a college (most of them do them) to do your GCSE's.
GCSEs don't really matter in the long run as long as you have at least a C in English and maths. If you don't, you'll just have to retake those during your level 3. I really wouldn't change to level 2 as there's pretty much no point in it. If you are getting higher level qualification, which you are, GCSEs won't matter after you're done with it.