There is no "right" way. Some people will recommend you use Aniko and john's videos, some recommend Oneprep and Youtube, there is no "right" way to study. The only "right" thing is to do what works for you. It's a LOT less about if you use the right question bank, or the difficulty of the questions as it is about looking at why you got a problem wrong, seeing how you can change the way you think or what you do in order to actually correct it and nto make the same mistake in the future