JEE Main

110 is not that bad a score. You can get good private colleges or if you wish to apply for the Advance, then go ahead.

Yes, you can get NITs but not the core branches such as CS, mechanical, civil and others. You will get another branch of your choice.

You can clear the entrances of VIT, BITS Pilani, HBTI, etc.

Yes, it is necessary because admission cannot be done in B.Tech without JEE Mains.

Yes. Their cut off marks are same.

Hello,
These are the answer keys for JEE Mains paper 2018:
I am attaching a link here solution for code-B paper also. All these are provided by the Resonance Institute.
https://www.resonance.ac.in/answer-key-solutions/JEE-Main/2018/Answer-Key-Solution.aspx

JoSAA Eligibility -Criteria for JEE Advanced 2018
Candidates should have successfully qualified JEE Advanced 2018 examination. The candidates should have scored at least an aggregate of 75% marks in their 12th standard qualifying examination. SC/ ST/ PwD category candidates should have secured aggregate marks of 65%.

Hello,
Please specify your category, however, if you belong from general then your chances are nil for getting computer science in any NITs.

Hello,
As per your marks and your category your chances are very high to get top notch NIT's, however, check here for more insights: https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Belonging to the general category, with 65% in board you can't get admission in any of the NITs, IITs, IIITs and out of any other CFTIs, even if you have topped JEE. The eligibility criteria is minimum 75% for general.