Result correlation between GMAT and GMAT Club's Tests

I took all 25 Challenges 3.5 weeks before my test (almost one challenge per day which is crazy but I felt great after taking all of them)

My socres for first 10 challenges were all over the park 57-90%. Later on I consistently scored 85-98%. Still I got a couple of horroble scores in in the last 15, but overall the avergae was around 90.

GMAT socre: Q-50 (95%)

PS: Don't worry too much of the scores and correlation. Most iportant aspect is to learn the concepts and you can learn a lot from Challenges. The challenges also help you develop a better thought process. The most important skill I learnt from challenges is to recognize the difficultly level of a question and guess after 2-3 minues. After a few trails I had a 80% hit ratio on questions that I guessed (of course EDUCATED guess - esp in DS) On the test day you have put your EGO in the locker and then take the test. Don't spend too much time on a single question. And I don't believe in the FOCUS on the fist 20Questions myth. Manage time better and give everyquestion your best shot.

Good luck!