B.Tech Computer Science and Engineering

The salary of B.Sc. Data Science after from IIT madras is 3 to 8 Lacs.

You must fall under the OBC-NCL category, I'm certain. You did pretty well in this category relative to the National Testing Agency's cutoff, which is around 67. This suggests to me that you have a strong Probability of being admitted to CSE. Based on your success in this exam, Shiksha has developed a college predictor that will assist you in determining the branch and college you will be admitted to.
https://www.shiksha.com/engineering/jee-main-college-predictor

In India today, getting admission without taking any kind of CET is nearly difficult. Of course, a student can get admitted to a school in Tamilnadu based only on their grade point average from their 12th grade exam. Additionally, some institutions that are considered to be universities such as the renowned BITS admit 12th-grade rank holders without the need for ACET. You might consider private engineering colleges with management quota seats for admission without ACET.

For pursuing B.Tech CSE in Cyber Security, there is no need of good percentage. You can easily get CSE in cyber security in any private college. For government college it will be difficult or may be impossible. Now if you have interest in computer and Statistics or Mathematics then only choose CSE in any college. Otherwise without any interest in computer related stuff and Mathematics it will only be waste of time and money in CSE in cyber security.

Yes, you can go for state Universities under some quota or in state government engineering colleges.

7.8 is the minimum percentile.

Based on the APEAMCET rank, The following are the options in asked college.
1. ECE
2. EEE
3. Mechanical

Greetings, Shankar Rana Rankings in the JEE Mains exam are used to determine admissions to NIT. Of course, you can learn more about the eligibility requirements. For several student categories, NTA publishes cutoffs. Only students with a percentage of the same or above are eligible to apply for admission to any NIT. Please feel free to reply with any further questions. I wish you well.

Hey Anshika
just go through this link and fill out the required details
College predictor in shiksha
https://www.shiksha.com/college-predictor

Physics and Mathematics are mandatory subjects. So BIPC students can not join B.Tech CSE.