<p>Have you tried looking at Gruber’s? Now, Gruber’s test prep guide is not just for math, so I’d get it from the library if you can. Before you buy a test prep book you should look at some of the problems and the explanations and think about whether it’s really worth getting. The best way to improve is to look at your mistakes and see what you’re doing wrong. I don’t understand why people spend over an hour a day studying for the SAT. I mean, I don’t know what there is to study that could take that much time. You clearly don’t know how to do the math, since you need help on the explanations. So why do you continue using the Barron’s book if it’s no good? That’s clearly a waste of time, and you clearly need to try something else.</p>