A student I worked with for years went off to college out of town. He found he needed to come back to town sometimes to get some good quality help. He said:
I used to go to some Exam Reviews where a guy would just spend hours teaching you a bunch of tricks to help you barely get by in your classes. People would spend a bunch of money on these classes and still end up doing poorly in their classes. When I talked to students who did well in the same classes, they all really understood the material. When I did what these students did (spent more time reading the textbook, practicing problems, etc.), I would perform much better in my classes. My grades shot up. And Mr. Gold was an important part of my program to understand.
Love it when students learn how to learn like that. As an adult: use reason to apply your knowledge to a situation; act; observe; evaluate; learn; repeat.