Disclaimers ahead : I work for 2IIM.

2IIM’s android app is the best app available for CAT 2018 exam preparation.

The app contains lessons, videos, slides and tests put together by a team of faculties who take up the exam year after year.

There are also 600 + CAT level questions (from the 2IIM CAT question bank) through the app as tests with detailed solutions either through tests or through videos as and when possible. One can be assured that all questions available will have solutions of some form or the other.

Great UI, Easy to navigate, single sign-on (Google/FB), test platform made available to challenge your grey matter!

Try this here : 2IIM CAT Preparation App – Apps on Google Play

Best Wishes for CAT prep!