For first lecture, I will cover convexity, starting with an abstract definition of convex sets. That is a topic which some find quite hard - meaning, do not panic, the course likely gets easier very soon.
Math 3 might possibly (TBD) use certain Math 2 lectures for review. You should try to choose seminars in other courses not to conflict with Math 2 lectures (schedule here). (Lectures only. Do not bother about Math 2 seminars.)