Need Help Quants, I keep getting stuck in the questions.

Hi so basically, I am a classroom student of Career Launcher, and have started my prep around 2 weeks back. Now the thing is that the questions that are given to us in the class, I am able to do them quite easily, and also in their quants book, but whenever I try to solve their worksheet or PYQs I get stuck in most of the questions. What should I do?

Should I switch to any other material?