Engineering Entrance Exam

The best books to prepare for IIT-JEE exam are-
Maths- RD Sharma and RS Aggarwal
Physics- SL Arora
Chemistry-NCERT and OP Tandon.

The best books to prepare for IIT-JEE exam are-
Maths- RD Sharma and RS Aggarwal
Physics- SL Arora and NCERT
Chemistry-NCERT and OP Tandon.

Do smart work along with hard work. And, try to revise the topic which you have been taught on the same days. Study for at least 3-4 hours daily. Clear your doubts as soon as possible, and focus on concepts. Try to solve the questions as much as possible. Trust me, You will definitely get a very good result if you follow this.

JEE Advanced is specifically conducted by the IITs to admit students.

You can get MNIT-Allahabad very easily.

Sorry to say but its a no as IIT strictly says at least 75% in all subject mean above 75% or 75% not less than it and as you said you are from CBSE, then you won't came in top 20 percentile because top 20 percentile of CBSE is above 85%. So, you try in any other college.
All the best.

If fee is a constraint for you, then opt for UIT RGPV and it's a decent college too with average placements but to know the exact scenario for faculty and placements get in touch with the current students through social media or in person.

You should be in top 5 thousand rank for getting admission in dtu and nsit if you belong from outside delhi.
It means you have to score more than 240 marks.

Hello Rujuta,
I am assuming you to be of general category. So, if you score 90 percentile in JEE paper 2, then you may get admission here but I am not sure of that so please make sure that you perform well in second attempt. For more details, click in the link below.
https://www.shiksha.com/college/vnit-nagpur-visvesvaraya-national-institute-of-technology-24399/admission

Hello Arjun, congratulations for your achievement. I am assuming you to be of General category. I cannot assure you. There is a big competition for CS branch, there is 90% chance that you will get it.
All the very best.