Be careful ...
In my experience (albeit limited) there are generally two schools of thought re: such "cram" methods of learning:
a. learn quickly to pass an exam
b. learn slowly to know what you're talking about 6 months later
It has been shown that people who cram in exam-passing type revision do indeed pass exams, etc. but forget a high percentage of their knowledge very quickly (not the stuff you actually use in the air of course when flight training).
Be careful - that's all I would say - and make sure that you focus on KNOWING and not just PASSING - there's a big difference.
Good luck to you and enjoy your States trip.