Soon I will be applying to graduate schools. In general, my interests lie in the domain of cosmology/astrophysics--don't know if theoretical or experimental, but I probably don't have the mathematical background for theoretical yet. However, most physics graduate programs do not start until Fall 2009, so I will have a lot of free time until then. I wanted to use this free time to self-study a variety of subjects for the sake of learning and to prepare myself for what lies ahead. My tentative plan is to study a variety of mathematical subjects that I likely will come across in a typical graduate program, because math is the most difficult part in understanding the physics. I would appreciate any feedback on subjects/topics to learn that would help me with these goals. Also feel free to suggest any textbooks that you have used and found to be great learning tools. What follows is the tail-end of my current knowledge from recent classes. Based on the content in these courses, I was wondering if it made more sense to continue working through these textbooks, or instead, start working through some graduate texts, like Sakurai (QM) and Jackson (EM) for example. * completed classical mechanics (Taylor) up through Ch. 8, which includes the Lagrangian formalism and central forces. * completed E&M (Griffiths) up through Ch. 6. * completed QM (Griffiths) up through Ch 4, the hydrogen atom and spin. * completed an undergraduate math physics course.