Best GRE math study guide?

My son will take the GRE this coming fall. He is not concerned about the verbal portion of the exam, but it has been a while since he’s had a math class. He’s an English major. Is there a study guide that is better than others at refreshing your math skills? He is very disciplined, so doesn’t need a course, just a book.

I would love to know this, as well!

I’m a fan of the Manhattan series.

I’m a Fan of the Princeton Review series…I love yellow book cover.