Well, I'll make a beginners series, because I could easily beat this in a few tries.
EDIT: Maybe you should just keep replaying the main levels, but replay them one at a time until you can beat the first level without dieing once, then the next, and the next, and the next.
I never even tried playing the main game. if any, i'll play super mario, you know, the ROM witht the feather and stuff. but i don't have time for that too... i have a test in judaism in...16 minutes from now. i'm in class, hoping for an easy test cuz i suck so bad and i didn't manage to study