How to prepare Math Gre

You can review old test exams, there are five of them.

You can find all five old tests here.

GRE Preparation

Unfortunately, there is no official solution manual.

I found some youtube videos containing step by step solutions:

Gre subject Math GR 9768 solution

Gre Math Subject GR9767 Solution

Gre Math subject Gr8767 solution

Gre Math subject Gr8767 solution

Gre Math subject Gr0568 solution