Most accurate CAT prep test for GMAT

I registered for Manhattan Prep GMAT Test before my first attempt of GMAT (3rd October 2017).
Comparison with other CAT test series -
Before joining Manhattan I was giving Princeton Review test series. According to my experience Princeton review Test series is not as matching to GMAT as Manhattan test.
CAT test detailed Analysis -
After giving the CAT test in Manhattan, You can get detailed analysis of the test. You will also get Your percentage of correct answer category wise (for example they will show You that You did 60% parallelism question correct in the test). This helps to analyse Your level more accurately.
Manhattan also gives detailed explanation of all the questions and I found all the explanations pretty good. They were easy to understand.
Comparison with GMAT -
I think for predicting Your score on actual GMAT, Manhattan test series is the best resource. During my tests before GMAT i was getting score of 620-640, and in GMAT I got 640. And in exam I was feeling that GMAT is almost same as Manhattan CAT tests. I think most of the people will get their GMAT score within variation of 20 from Manhattan tests.
So before giving attempt to GMAT is best to analyse Your level through Manhattan test series.