90% + score is easy in CAT exam.The real competition is going to start beyond that.

you are now in 2nd year so you have enough time to prepare well for 99%..in first 6 month you have to prepare for basics..Go through Arun sharma For quantititive aptitude and Logical reasoining..

Once your basic will covered then start giving sectional mocks and keep revisising and brief solution of it...Make your own notes for quant Formulas and properties...

For LR section its quite simple..Daily do 4-5 Logic problems..You will get it from.youtube & Othee free resources..

Solve old Cat papers..

Giving Full length mocks in last 6 months..

For English You have to read Newspaper daily,read novels and different topics material which will help you to remimber different Jargons and words..You can catch 99% in this time..

All.the best.