Stoichiometry is simple arithmetic and, at worst, whole-number fractions. Firstly, it's an enormously simple concept and I don't even know how it's possible to be "bad" at it. Secondly, this is a forum for pre-allopathic students; all these threads about "specific subject X is hard! wah!" are so stupid.
It's like the people that sign up for calculus, then bitch the entire time about how they'll never have to do an integral in real life, so what's the point!
You'll never be a good doctor if you can't do stoichiometry.