LLB

Hi
3 year LL.B. Is a graduate level course pursued after graduation in any other stream. If you want to specialize in laws like tax law, corporate law you have to do an LL. M. in those fields.

Yes, you can pursue a 3-year law course in Rajiv Gandhi University of law. See this link
https://www.shiksha.com/university/rajiv-gandhi-university-Arunachal-Pradesh-other-32725

Yes you can pursue LL.B. with maths and economics. You can opt for BBA LL.B. Integrated 5 year course.

According to CDS eligibility criteria 2020, candidates applying for the exam must be 20 to 24 years. Candidates who have passed graduation or appearing for their final year are eligible to apply for CDS exam provided they submit a relevant certificate of passing the examination at the time of commencement of course.

Yes, you will have to appear in the entrance exam and score a very good rank to get admission.

You should have scored a minimum pass percentage either at the 12th level or graduation level. The percentages are 45% marks for General category, 42% for OBC and 40% for SC/ST categories. at graduate add 5 % to these.

For getting admission in law, you have to give CLAT exam and then only you can get admission.

You have to complete your law course with good marks to become a great legal adviser.

Yes, you can surely go for evening classes.

The fee varies from college to college. It depends on where you take admission.