CBSE 12th

As there will be two JEE Mains exams this year, so after first exam only the percentile has been released right now. However, after the second exam that took place, everyone will know their ranks on the official website only. Thereafter, the marks needed to qualify will be disclosed after the second exam result that took place in this April.

Hi Vivek!
As you're interested in computers & physics, my suggestion is that, you can take either B.Sc. Computers or B.Tech in CSE. In B.Tech you have only Computers education in 3 years out of 4. In B.Sc. You've physics in first year & remaining years are of computers.

As per your low percentage, you are not eligible for any of the college affiliated to University of Delhi, but you may approach some good private colleges.

Yes, you are eligible only if you have minimum percentage in PCM of above 65% and you should have above 50% percentage in English.

Syllabus for Mathematics: Differential Equations, Statistics And Probability, Permutation & Combination, Integral Calculus, Mathematical Induction, Complex Numbers, Sets, Relations And Functions, Mathematical Reasoning, Trigonometry, Three dimensional Coordinate Geometry, Binomial Theorem And Its Simple Applications, Matrix & Determinants, Limit, Continuity And Differentiability, Co-Ordinate Geometry, Vector Algebra, Sequence and Series.

For becoming an IAS you should apply for Bachelor of arts (BA) with subjects like history, geography, political Science and economics. Because these are those subjects from which questions are asked in IAS exam so after you study them in your graduation, then you do not have to study it for UPSC.

Eligibility for B.A. in criminology and police administration in UNOM is:
The candidate must have passed his/her 10+2 from a recognised board. Admission is based on the marks obtained in 10+2.
For more details: https://www.shiksha.com/humanities-social-sciences/course/b-a-in-criminology-and-police-administration-institute-of-distance-education-university-of-madras-chepauk-chennai-289332

If you are asking after your 12th grade then yes, you are eligible, just go and find out a university that suits you the most.