6A's and 2B's is definitely enough, so don't stress out. My friends did worse than that and got onto some good courses there. Greenhead will look at your mocks probably more than your targets, so if you got A*s in your mocks last year then I'm sure you'll be able to get A's and A*'s again! Besides, even with B and C grade mocks, people were offered places. We did our mocks in December and those were the grades they were interested in for us, I think most schools do them around November- January so you will have those grades in time for your application! I applied through UCAS and I had to enter my predictions onto there myself. Greenhead do put alot of emphasis on mocks but unless you go to a private school, even if you get B's you will be accepted. I went to a school in Wakefield, but people from Greenhead travel from all over. I sit next to people from 2 hours away in some lessons! Which subjects are you considering?