Magoosh - brilliant in Math - and lots of questions to practice.

First of all, I want to say that I have been a Magoosh client since 2014. I really liked how thorough the quant material is explained. The videos are structured by the topic. At the end of each topic, you can take a quiz. Can't say much on the verbal, as I combined Magoosh with E-GMAT. Nonetheless, I can say that the questions represent additional practice.
Very Hard questions seem pretty challenging, yet the concepts tested are very simple...it only makes you faceslap yourself for making such silly mistakes.
Mike McGarry is an awesome teacher, and his feedback is always valuable. Overall, Magoosh's feedback is way better than the ones from other companies (i.e. e-Gmat).

I strongly recommend taking the courses if you need to brush up your fundamentals in Quant.

Quick update: Magoosh helped me to increase my raw Q score to 49, which is not bad at all.