If you're weak on Quant, take this course!

I'll start off by saying that I owe my GMAT Quant score (49, up from...much lower than that) pretty much entirely to Target Test Prep. Coming into my GMAT prep, I hadn't taken a standardized test in almost 10 years and had not thought about geometry, probability or rate problems since probably freshman year of college. TTP was perfect for me because it really walks you through every major topic and hammers you with questions to make sure you're really comfortable with each type of problem you'd see on the test.

TTP might not be a good fit for you if:
-you're not a self-directed learner, since there aren't scheduled classes or accountability.
-you don't have the time to put into it. I got through it in 3 months doing 3-6 hours per day, and wouldn't recommend skipping modules or tests
-you already have a strong foundation in the quant topics. While I still think there's value to be found in the sheer amount of practice questions TTP has, it really breaks down topics that I could imagine might be oversimplified if you're more recently familiar with these topics

My advice is to do the free trial and see how you like the style of the lessons and answer explanations. The video and written explanations for problems really clicked with me, so I knew pretty quickly this was going to be the program for me. The interface is really clean and easy to navigate too, which I appreciated.