CAT

Below are the books for preparation of CAT:
How to Prepare for Quantitative Aptitude for the CAT Common Admission Test 5th Edition (Paperback) by Arun Sharma, Publisher: Tata McGraw Hill
The Pearson Guide To Quantitative Aptitude And Data Interpretation ForThe CAT by Nishit Sinha, Publisher: Pearson.
Quantum CAT: Quantitative Aptitude Common Admission Test for Admission into IIMs (Paperback) by Sarvesh K Verma Publisher: Arihant
Word Power Made Easy by NORMAN LEWIS.

There are different books on different subjects & for reasoning (which is the main part in CAT). I will prefer 'How to Prepare for Logical Reasoning for Cat by ARUN SHARMA'.

IIMs are the best option. For that, you need to study well. Dedicate yourself to your studies. CAT is a bit difficult. For getting into IIMs, you might require 98-99%ile.

Nowadays, masters in engineering won't fetch you a good salaried job. If you go for MBA that too in IIM through CAT, the companies will automatically target you to join their firm. So CAT is the best option.

Hi Biswajet,
To get admission into MBA, NMIMS conduct its own entrance exam called NMAT. It doesn't accept CAT/XAT scores.

Hi Raghavan, CAT scores are not accepted abroad, however, there are a very few management schools which might. In Germany, please check ESCP Business School. They may accept CAT for specific programs.

For IBSAT cut off is around 85 percentile and for CAT it is around 80 percentile.

You can expect around 90 percentile at this score. You may get calls from IITs, KJ Somiaya, TAPMI, BIMTECH-Trichy, IMI-Delhi, LBS-Delhi, FORE-Delhi and similarly ranked colleges. You can check the below link for last year's analysis –
https://www.shiksha.com/mba/articles/cat-2017-exam-analysis-blogId-15108
https://www.shiksha.com/mba/resources/iim-call-predictor