CAT

Be strategic and plan your study schedule according to week n strong areas. Give mocks and analyse them carefully.

Questions related to Quantitative aptitude, Logical reasoning, Data interpretation, Reading comprehension and Verbal ability.
QA-Arun sharma, LR and DI-Nishit K. Sinha, RC and VA-Menakshi Upadhyay and Arun Sharma.

IIMs doesn't publish the Cutoff. Also all IIMs have different criteria (weightage for 10th, 12th, graduation,CAT score, gender,work ex) for calling for interview.You will get more on this on IIM websites. So, it is difficult to say the minimum cut-off.
The best thing to do is to practice and score well in CAT exam.

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NB: copy from CAT 2017 website
Hope it helps. Best wishes for CAT 2017

Regular and consistent efforts helps a lot. In terms of knowledge it will helpful if you have basic knowledge of mathematics. Reading books help in reading section. And there is no rank, its percentile in lay man terms where do you stand among the total number of students writing the CAT.
Since you are doing B.Tech, my suggestion will be to concentrate on academics, participate in all activities which will help you to find your interest area, increase your general knowledge(Newspaper preferably English). For CAT, 1 hour/ day will be more than enough.

Arihant is good at last 2 months. For comprehensive study, take Arun Sharma.

Hello Aishwarya,
The definition of best varies from person to person. For some students, national status matters more and for some others, the main criteria is international standing. Please let me know more details about your requirements so that I can give you more specific advice.

For Quantitative aptitude - Arun Sharma, publisher - Tata McGraw HillData interpretation - Nishit K. SinhaLogical reasoning - Arun sharmaVerbal ability and reading comprehension - Meenakshi Upadhyay and Arun sharma
Prepare from previous years CAT papers. You can also take study material of T.I.M.E. or any other coaching institute.

Hello! The cutoff of all major B-schools accepting CAT scores is generally always 95+ percentile, and not as low as 50 percentile. So if you wish to pursue your MBA from a good, reputed B-school, you have to score really well.