This video covers the first half of Stoichiometry to help you get a solid foundation in mole ratios, then it goes into the easier type of problem where they give you a quantity in moles (not grams) and ask you to solve for a quantity in moles (not grams).
Harder Stoichiometry Problems
This video covers the type of stoichiometry problem that will comprise the majority of your test, and which is used in limiting reactant (reagent) problems as well. In this type of problem, they'll give you a quantity in grams rather than moles, and then they'll ask for your answer to also be in grams. Not a ton harder than mole-mole, just adds a couple steps to the dimensional analysis.
If you do not have an account, you should get one, because it is awesome! You can save a playlist for each test or each chapter, and save your "greatest hits" into a "watch right before the final" list (not that we recommend cramming, but when in Rome...)