I am planning to give the MATH GRE. I intend to go to physics graduate schools but I may have to given the MATH GRE according to my college's requirement. I very much like maths, but I'm overloaded with physics related work, including the GRE, since I have been making a transition from economics/maths to physics/maths. What are the essential tips for someone like me looking to prepare for the GRE? What books should I go through for each topic?