JEE Main

Dear Ramavath!
That's not possible to get admission in B.Tech 2018 with your 2017 JEE Mains score. Because the validity of the JEE Mains Marks (and Rank) is of just 1 year. So, you must have to appear in that exam again and score a very good rank. Hope this helps. Good Luck
Upvote the answer if you feel satisfied.

It depends. 50% of the seats are reserved in terms of Chandigarh quota. Else you can check the last year closing ranks in the internet.

JEE main is conducted for all engineering branches including Computer engineering.

You can consider your admission in DTU and NSIT to be eligible you must have secured at least 60% aggregate marks or more in Physics, Chemistry and Mathematics at 12th class. There is relaxation of other backward categories as well.

You are eligible to appear in BITSAT as well as JEE Mains. You can consider any of the following links:-
For preparation guide and sample papers of JEE Mains:
https://www.shiksha.com/b-tech/exams/jee-mains/sample-papers
For preparation guide and sample papers of BITSAT:
https://www.shiksha.com/university/birla-institute-of-technology-and-science/exams/bitsat/sample-papers.

You have to score at least 75% marks to get admission in NITs, IIITs etc. But, you can get any other government or private engineering college based on your rank.

You have to score at least 180 marks in JEE Mains.

For JEE Mains preparation tips, visit the link below:
https://www.askiitians.com/iit-jee/main/preparation-tips/
To know the details of JEE Mains exam visit the link -
https://www.shiksha.com/b-tech/exams/jee-mains
Here you can also get sample papers for JEE Mains which can be very helpful for your preparation.

JEE Mains paper is conducted by CBSE board not by any IIT.

Around 5000 for general category. AIR-5k.