The tips begin at a different place in each module. The advice moves along with the stages of the course.
When you feel yourself getting stuck on an MCAT question and can't let it go, that's when you need to let it go. Choose the least worst answer. Flag it, and move on. It feels good! In the science sections, you can still get a perfect score even if you miss a couple of questions. You don't have to be perfect to be perfect!