I have numerous related work experiences, including working as a line therapist for 3 years, tutoring elementary and high school students in reading in math for 2 years, working as a summer camp leader for people with disabilities for one summer, and I'm currently working as a rehab tech in a rehab center and I observe numerous speech sessions. Also, I was a member of the NSSLHA chapter at my undergrad university for 2 years and my senior year I served as president of the chapter. I thought that my numerous experiences and high GPA would make up for my low GRE scores, but it isn't working.
I find it kind o hard to spend $500+ on a prep course that might not even benefit me. What are some other good ways to prepare for the GRE?