I think you've done the right thing - he can't always rely on you!
If there's an exam, you're not going to be able to sit next to him telling him the answers.
Personally, I hate having to ask for help from friends.
It's usually best to ask a lecturer/tutor anyways, as friends might not always know the right answer or method for doing something (not saying that you didn't know, just giving an example).
I still get this, it annoys the hell out of me. You're doing nothing wrong, OP - this guy has to learn to sink or swim on his own.
Tell him "Sorry, I have my own work to do. Gotta go." and then block him on MSN during the times when you can't be bothered with him pestering you.
There's no "Relying On Others" degree anywhere. Tell him to get to...
i empathise with the guy struggling with his course.i used to be in this situation cos i went for a course that i stood no chance of passing last year in a university that is renowned as number 1 in that field in the world.i was amazed at how frustrating life could be if you are struggling and/or almost hopeless academically.
i persevered till the end but i failed the exams gallantly before dropping out.i now have a fresh start studying a course that i'm very.very enthusiastic about in a decent uni(although not a top one).the reason for relating this story is just to get in across that it doesn't worth the effort and the stress if you are doing an academic course that you lack the necessary foundation and aptitude to suceed in.