Best mock test package in terms of number, content, scoring algorithm and result insights/analysis

I used Experts' test series for my GMAT prep. The series comes with 15 mocks, which contain questions at par with the official GMAT questions. The scoring algorithm very closely replicates the actual GMAT test scoring algorithm. I got the same official score as my last mock score even at the sectional level (this could be a mere co-incidence, but in general you can get a fair idea of how you'll perform in the official test through your scoring trend). The insights at the end of each test are scientifically designed and help us in monitoring our performance and making necessary course correction. The test series helped me in raising my score from 600 to 720 (Q49 V39) in just 21 days. I highly recommend Experts' test series for GMAT prep.