aashraiarun - No doubt
GMAT Club Test Center is the next best thing after GMAT Prep and official guides, for the quant section. Typically, GMAT Club Quant sectional tests contain questions slightly tougher than the ones on the official CATs. If you score Q47/48 on
GMAT Club tests, you can fetch a Q50 on the real-GMAT. To further answer your question, yes, the average difficult is higher in
GMAT Club tests and the tests offer a few more 700-level questions than on the real-GMAT. Also, please remember that we do not have experimental questions and therefore all 700-level questions are scored by the scoring algorithm, resulting in a slightly lower sectional score.