As many already know, studying for the physics GRE and getting accepted into a graduate program is not the final hurdle in your physics career.
There are many issues current physics graduate students face such as studying for their qualifier, deciding upon a field of research, choosing an advisor, being an effective teaching assistant, trying to have a social life, navigating department politics, dealing with stress, utilizing financial aid, etc.
I'm studying for my Q this summer and I know some schools post past Q exams online for students to practice with. It would be cool to get a bunch of links to practice Q problems all in one place, so if you know of or come across sample Q problems online, post a link here.
Here from U of Virginia are some qual questions worked out for Quantum and E/M, so you can compare your answers with the ones given. The first 10 or so might be too easy, but the second half of Quantum ones and later E/M are fairly tough and should be good practice.