I cannot recommend
Target Test prep enough. I was garbage at GMAT quant to start and frankly did not believe I would ever get to consistently scoring 48-50 on CATS and thought my only shot was to crush verbal.
TTP is not something I would recommend if your plan is to study for a few weeks. It's an input / output exercise. It is by far the best resource I have come across (Have used
GMAT club tests, stalked Bunel and read his writeups,
MGMAT and veritas). Why
TTP is so great is it goes methodically through each iteration of each type of potential GMAT problem. Each solution not only has a written answer but also accompanying video so even if you can't follow the calc, you can literally watch him draw and talk through each piece, step by step. It has by FAR the best UX i have seen turning it almost into a game that combines content, interim quizzing, strategy and Unit tests. Each subject is methodically explained to you in a nice ELI 5 fashion (explain like i'm 5). You start with easy quizzes to build a baseline understanding and then medium and then hard. You are not supposed to move forward until you achieve a certain score on each test difficulty. As you move forward into different topics, there are always review quizzes so you don't immediately forget what you learned. Not only does this keep an error tracker for you that figures out what you're good at, what you suck at, and how long you take on each type of problem, it drills down to a level i have yet to see anywhere else.
TTP doesn't just bucket "distance rate problems" it will bucket further into specific question types such as diverging rates, distance / rate with variables every type of question or iteration that the GMAT could throw at you. I have spent about 2 months on the platform (multiple hours a day), and now when I Do
GMAT club tests, or CATs I never see a problem I haven't seen before (granted I don't always solve correctly), but the pattern recognition is incredible and I attribute to
TTP. I have referred two people at my firm that now also use and love it. I have no relation to
TTP, just a candid review from a guy who has been trying to crack GMAT quant for ~6 months now. I also think they could charge alot more than the $99 a month they charge. They offer a free trial, so I would check it out to see for yourself. When I started using I immediately knew this was exactly what I needed and the results soon followed.