Exam

There are many online classes going on for preparation of these entrances. You can also take help of books available in the market.

Firstly congratulations regarding the score getting the score itself isn't important even counselling process also matters a lot. Firstly keep top colleges first there will be no problem regarding it since we can keep as many as we want in the list and then proceed in the decreasing order of colleges at last keep the unwanted colleges this ensure you to get a better version of colleges.

Your academic performance is really outstanding. The minimum overall CAT cutoff of top IIMs is remaining between 80-95 percentile. While the sectional cutoff is also important and is remaining between 70-85. The following components with their corresponding weightage plays important roles in a selection of a candidate.
IIM Bangalore criteria :
1. CAT : 25%
2. PI : 30%
3. What : 10%
4. Bachelors Degree : 10%
5. Work Experience : 10%
6. 10th Marks : 10%
7. 12th Marks : 05%
The above criteria can varying according to IIMs. for selection point of view you have to score above 98 percentile in CAT for more probability.

Please write about the college name for better response. However for NITs, JEE Main percentile above 97 can be good enough for admission.

JEE Mains exam is an Entrance exam through which you get top NIT'S colleges of India For Engineering stream (B.Tech). I am sending you a link. Please check it out for all information regarding JEE Mains. link-https://www.shiksha.com/b-tech/jee-main-exam.