I can help you the Maths of GRE, as I've done Barons GRE 3 to 4 times, completely and I find it overall easy. I'd done them 2 years ago, so if there are major changes, I'm not aware of them, but from my experience I think they are pretty much the same. If you like we can have a demo class or session with some numericals. Furthermore, I've had experience in designing solutions for high school and college maths, and publishing them in prints for companies who print solution manual for school and college books. Anyways, I'm excited to go through the exam preparation myself, while helping you out.
I've BID for 7 days/14hrs (interactive) for 160 bucks.
Thanks!! Happy GREing!