This page is to make you familiar with the topics. You do not have to master the concepts, but understand them. They will be covered quickly at the beginning of the year in Calculus, but it will be a quick overview.
The Lines section is there to help review the material, and can be skipped if you are really good at it. You really should take a look at the other links. Don't worry it won't take that long (quite a few of the links are less than 5 minutes) and you'll be really happy in September that you did it!