Definitely, plus get a degree at university, you'll probably want at least a merit, if not a distinction. Hard work. (btw merit = 90%+, distinction = 95%+ i think...)
PS3player, GCSE's are far from a walk in the park to get A* at, start studying and revising hard through year 10, i din't, and now i've screwed everything up. Crap is aflling to peices left right and center of me, so fuckin work hard, never undrrestimate when you get told to revise, just fucking do it. It'll be so much better in the longrun. Trust me. Please.