I'm at college currently studying for my GCSES. I'm retaking maths and English Lang (although I've passed them already) and biology, chemistry and physics. I had my mock exams in January and I did quite badly in them. now I've been entered for the foundation tier even though I know I'm capable of getting all A's in my sciences if I just work hard. how can I get my teachers and heads of department to change my tier to higher at a later date if they see I'm significantly improving? also has this happened to anyone before where they've changed tiers at a really late date? can this be done or should I just accept doing foundation? I'm pretty discouraged at this point because I want to do A Levels and I can't do them if I get Cs only.