IMS SimCATs were by far the most comprehensive mock test series for CAT 2016. They had mocks of varying difficulty levels, which helped to test different test-taking skills. One should give loads of mocks - and enjoy them! Aptitude exams are tests of strategy and mocks will help you devise YOUR strategy. There is no unique strategy that works for all. And IMS SimCATs certainly help you build that strategy. Kudos to IMS!