GMAT Club Tests Review

I started preparing for GMAT exam and found GMATClub.com as a very useful website and specially liked its discussion on questions including OG questions. Then I got an opportunity to try GMAT Club tests for 7 days after subscribing to its Youtube channel. Later I joined GMATclub premium membership and got access for 6 months. In the meantime, I won e-GMAT online course as a prize for winning Game of timers (GOT) competition. With the combination of GMATclub tests and e-GMAT course, my verbal score improve from early V20's to V45 recently. My quant score also improved from Q40's to Q51. Quality of quant questions in GMATclub tests was very good. Many of them were of 700-level difficulty. I got 690 in my first GMAT attempt and I scored Q50 in quant and V34 in verbal. I noticed that quality of GMATclub quant questions was more difficult than actual GMAT questions. I did not face any difficulty in facing quant questions in GMAT and finished the quant portion of the test 10-20 minutes earlier than scheduled time.
I recommend GMATclub tests for improvement in quant section of GMAT.