This chapter talks about the many isomers that exist as well as chirality + stability of molecules.

This is the basiccccs of orgo, but, in order to master the contents of this section, you must be familiar with the simple naming schemes. 

This episode covers the very basics of the brain and a few things you're expected to memorize for the MCAT. Beware: this chapter is very dense and much of it will require you to memorize on your own.