Omair..calm down pal...
I believe you are doing your IG's..I did mine last year..the worst year EVER in IG's..Chemistry was horrible, bio was long..but guess what..8A*s and 1 A were my results..
Revise your notes thrice or even more..then do past papers...IG's is all about pastpapers.. If you do past papers, you guarantee ate LEAST 80% of the Paper u will know in t he exam..
For hard/unexpected questions, be sure all others out there will find it hard too..so dont worry abt it...the curve then would be high...Chemistry IGCSE June 2009 was pure nonsense, but all my frineds and mates, even ones who dont know anything abt chemistry, got A*..
Chill dude....and look on the bright side, 2 more months the u r FREE!