My personal opinion is that the internet is the best means to prepare GSA (and almost all other subjects).
For Math, if you solve the GRE book (Barrons) and the GAT book, I think you will be able to attempt any possible exam questions.
PS: If you have adopted Geography and Environmental Science as your optionals, you can get around 40% of GSA material just from there. Very helpful subjects in GSA, CA and even essay.
__________________
SR
|