CBSE

The paper is objective type only. The syllabus is of class 11th and 12th only. No negative marking is there.

It depends on your rank, and the result will only be sure after counselling. As you said about the score, there is a chance that you may get a college. But, not so sure about it. So, wait for the result, and if you have any other exam, do your best.

Hello Shraddha,
Yes they are also eligible. The students can get admission based on their board exam marks. So they need to enroll for a counseling process. All the best.

Hello Aditya,
Yes, CBSE will be conducting re-exams of economics (class 12th) tomorrow.
https://timesofindia.indiatimes.com/home/education/news/cbse-class-12-economics-paper-2018-important-tips-and-sample-paper/articleshow/63890155.cms

Hello, I think you may get admission but first check through Shiksha JEE College predictor tool. Link: https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

Practice, practice and practice. There is no hard and fast rule, you need to know your weakness and strengths. Practice with previous year papers and improve time management. Make a routine and follow it. Revise regularly. Don't forget to take rest, eat good food and take good sleep besides studying.

There are less hopes of getting CSE if you are from general category. All the best!!

No, it is not necessary to be a CBSE student. If you take coaching for IIT from any good coaching institute, you can crack it.

Yes, you can definitely get CSE in SASTRA, Thanjavur. Best of luck for your future and if any query feel free to ask.