Hey bud,
CFAT Trainer app is really, really good, for all three subjects. I'd recommend you spend the $7 to buy the Full Version as it contains over 700+ questions. You are able to "Practice" with no time limit or "Test" 1.5 minutes per question (total of 45 minutes). You can do each subject (Problem Solving, Spatial, Verbal) individually or mixed. It has helped me tremendously.
Khan Academy is also another good one, as mentioned here. If your math is not up there, you could also do the entire subjects, for example "Early Math", "Arithmetic", and "Algebra" to get Math back in your head. You don't need any other subjects in there, but it is free, so you're able to do them if you wanted to.
I've been studying these two together and I've made some serious progress.
Best of luck!