Hi, originally OC 7.6 and OC 7.7 were called "Oxidizing Alkenes - Part 1" and "Oxidizing Alkenes - Part 2", as you can see in the intro title slide. I edited their names to be more more specific, so OC 7.6 is "Epoxides and Dihydroxylations" and OC 7.7 is "Ozonolysis", so it's easier to navigate those videos and find what you need. Those are the two parts he is referring to, they're all there.
Writing DAT questions can be difficult, because it is tough to come up with good distractor answer choices when you haven't covered all of the material. Good questions typically use multiple concepts from multiple chapters. The correct answer though is always something you have already reviewed and learned, and working on DAT-style questions this early on will help improve your scores and studying later. So answer the quiz questions as best as you can, and Dr. Mike will usually review every answer choice anyway so you can quickly see what is coming up.