Yamin, have a look at the first page of various University Admissions - usually they have a broad brush statement - it used to say a minimum of 5 GCSEs A-C including Maths and English (and for some Unis Science as well) but may have changed more recently (to a point based system, in anticipation of the GCSE changes.) Most 6th forms look for more than this for A level entry, (for eg so many points out of your best 8 subjects) obviously, often with a minimum of an A or a B grade int eh subject you want to study at A level.
Hope this helps
Edited to add Unis I have spoken to have all indicated that GCSEs are going to become MORE important as it is the only thing they will have to go on when making offers...
Yes thats helpful, thanks. I know about the new points system for admittance to our school say, at so many points. I think for more "inclusive" 6th forms its still OK for 5 with maths and english as you say.
Hard with the uni thing if not sure what to study! But few years yet I guess