I used to teach at Kaplan and was shocked by how much my students' scores improved from their assessment to their final practice test. If grad school is your dream come true, and you end up not getting into any programs this cycle (keep hope alive), consider signing up for an in-person, classroom setting prep course. Your GRE scores are the easiest portion of your application to improve in the shortest amount of time. The courses are not cheap, but if money is tight, start setting aside $50/month now, and you'll have a little bit to put toward the course in the fall. I think options like Magoosh are strong, but in my option, nothing beats being in a course, live, with the ability to ask your instructor questions tailored to your mistakes/weaknesses. If you have a lot of money to throw at the GRE, consider adding additional individual tutoring to the class.