I've been out of undergrad for several years now, and I'm planning on working full time during the summer just to prepare for the workload. I'm attending the University of Hawaii, and I'm fully funded.
Is it better to focus deeply on a specific topic (calculus, real analysis) or to review all topics as much as possible? What should I prioritize? My research area is pure math, and I will most likely be focusing on number theory, but this could change depending on what I am exposed to and what my professors are like.