If you're gonna transfer this year i'd call them first and check that you will carry on paying the same fees, as it might change. But you'd get a student loan for that anyways so it wouldn't really matter if you did have to pay £9000 next year.
If you apply as a grad you'll have to pay the full £9000 fees, with no loan, so you'd have to source that money from somewhere (altogether you're gonne need about 40- 50K)
From what i've seen a lot of grad entry uni's ask for a level bio. I think it'd be a good idea to take it tbh, just to strengthen your application