The tips begin at a different place in each module. The advice moves along with the stages of the course.
A typical graph of the forgetting curve shows that humans tend to halve their memory of newly learned knowledge in a matter of days or weeks unless they consciously review the learned material. Things slip away, and later, during full-length practice you find yourself saying 'I'm supposed to know this!' The solution to the forgetting curve is a discipline of regular spaced repetition throughout MCAT review. Everything needs a visit.