Exam

You should opt for paper based instead of computer based.

CET cut off is around 70-75 percentile.

Entire details have been mentioned below. Recommended to go through dates and paper pattern, syllabus and marking scheme.
https://www.shiksha.com/mba/exam/cat

CAT is widely accepted, I recommended you to opt for GMAT and CMAT so that you can apply to all great colleges in Delhi like IMI, IIFT, FMS, Lal Bahadur Shastri, etc.

Yes, you can get admission in Christ University on the basis of February MAT score. For more details, refer to the link mentioned below:
https://christuniversity.in/mba-admission

There is no limit.

For distance MBA program, there is no open test. However, work experience of around 3 years is required to get admission for distance MBA programs.

Hi Priyanshu,
It is good to hear that you have such a high ambition in your career. You should understand the basics of physics, chemistry, mathematics and computers that you will be learning in class 11th and 12th.
You should ensure that your marks are above 80% in class 12th board examinations. Alon