The videos to the right are supplemental lectures that will assist you with Chapters 2 and 3 in Campbell and Reese. Chapter 2 should be a review of Chemistry. Take note of anything that is particularly confusing (or is brand new) and prepare to ask clarifying questions when we get back to school.
Chapter 3 is not required summer work, but I highly suggest that you get some exposure to this material before we plunge head first into Organic Chemistry.