Quant questions

I was using a lot of materials for Quant preparation.My first attempt Quant score was Q20. Then i went through the GMAT Club forum and then attempted free tests.It gave me a different picture about Quant preparation method.I gave few mock tests and could see an improvement in the Quant score from Q20 to Q38. After attempting GMAT Club Quant mock tests,now i feel more confident to face any quant problems ,especially DS problems. GMAT clubs test series is more similar to actual exam questions and it will give you a clarity.Other materials have a lot of complex problems which are not really required from exam stand and will take more than 2 minutes to solve them.