Don't study endlessly, I tried that route and funnily (if that's not a word it is now) I got a lousy mark. Take breaks, study for 45-50 mins (hard studying, not half-assed study+gaming) then get a break, do something for 5-8 mins then go back. As for the others, either they're going to fail or just tell them mind their own business (or drop dead, fuck off, fall down the stairs, jump infront of an 18-wheeler, and on the list of possiblities go).