Hi Sagnik,
As you're in your 2nd year, you have plenty of time and chances to score high in the exam.
I would suggest you to start making a habit of reading novels and newspapers. It will increase words in your vocabulary and speed to read fast. For quant, if you're not able to study, I would suggest starting solving the puzzle. It will give you exposure and develops thinking and reasoning ability. Preparation of exams like CAT cannot be done in 1 night but you need to study daily.
Recommended Books
1. Arun Sharma’s The Complete CAT Digest, by Tata McGraw-Hill
2. How to Prepare for the CAT Common Admissions Test by Muhamed Muneer
3.How to Prepare for the Verbal Ability and Reading Comprehension for the CAT by Arun Sharma
4.Nishit Sinha’s The Pearson Guide to Verbal Ability and Logical Reasoning (Pearson)
5. Word Power Made Easy by Norman Lewis
6.How to Prepare for Data Interpretation & Logical Reasoning for CAT (Tata McGraw-Hill) by Arun Sharma
I would also suggest you to solve previous years question papers
You can also refer to the study material of some coaching centres like T.I.M.E
And if you're preparing on your own, you can use some apps and online forums to clear your doubts
Sharing the links of some, hope they might help!
1.
https://play.google.com/store/apps/details?id=com.instasolv.android2.
https://play.google.com/store/search?q=magoosh%20gmat&c=apps