If you have the time to follow the Target Prep Quant course, you will definitely, substantially improve your Quant score! Their target oriented, modular, methodology is just perfect for any kind of test takers. It helped me a lot! It's also worth highlighting that in my case, despite a lack of time next to the test scheduled date, with which I wasn't able to fully follow their study plan for the last modules, I was able to perform as I needed. Just be aware that it will take a significant amount of your time, so get prepared for it in advance.