I have just completed my undergraduate degree, and will be taking the GRE and applying to graduate school this fall. I'll be applying to terminal master's programs because of my lackluster GPA, a 3.3. This is in hopes of continuing my recent track of improved grades, and hopefully strengthening my Phd application afterwards. This coming year will thus be a gap year for me. Besides preparing for the GRE that will take place in a few months, what should I be doing in this time that would be productive for me? Basically, how should I spend my gap year so I get the most out of it, physics-wise, for my future? Any input is greatly appreciated.