Best way to improve your quant score

I've always struggled with the quant section more than the verbal on the GMAT even though I'm not a native speaker. I had already taken the GMAT once and completely bombed the quant section, scoring a 650(Q43,V36). When I was trying to analyze what went wrong, so I could practice and improve my quant, score I realized I hadn't practiced with the toughest quant questions available, But I also wanted a score improvement guarantee, So I bought a magoosh subscription(which comes with 3 months of free access to GMAT club tests) and finished all the questions on magoosh. However, even after that I hadn't even hit a Q48 score on a practice test. Frustrated, I decided to turn to GMAT club tests. I hadn't started with gmat club tests earlier because when I tried it in the beginning before finishing the magoosh material, I found the quality of questions to be very high, and my performance was so poor, it was very demotivating. But having completed, all the magoosh material, I was finally ready to tackle Gmat club tests, My score in Gmat club tests were still pretty bad. But on practicing around 200 questions from the Gmat club tests set, I tried a full length veritas prep practice test, and finally scored that Q48. So now I'm trying to work through the rest of the GMAT club test problems, So I can hit that coveted Q50-51. This is the first time I've felt like it may actually be within my reach, on the brink of possibility with a little more effort. I recommend Gmat club tests to anyone who is struggling with math. The difficulty level is definitely bound to get to you in the beginning, But do not get frustrated and give up, Do not get demotivated or discouraged. These questions are harder than what may be asked on the GMAT. But they are great to train your brain in to thinking critically for data sufficiency questions and just generally build the stamina to tackle the GMAT quant section. Stick with GMAT club tests, You will definitely see improvement. I haven't tried the verbal questions in Gmat club tests, and so I cannot comment on that. But definitely go for gmat club tests to improve your quant score.