LLB

I really don't think so that there is any fees concession for ST candidates. You can refer the link to know the details: http://mnlumumbai.edu.in/10012019 CLAT Brochure2019.pdf

No, there is no options for that. After your graduation, whatever the stream you studying, you can take admission in LL.B. Though you may take Pre-law course after intermediate.

Distance learning courses of LL.B. Is not recognised by the bar council of India. You need to pursue a full-time course.

Yes you can take the CLAT exam after B.Com as there is no age limit for CLAT UG after a 2017 ruling by the Supreme Court of India. However, it is important to note that usually, one takes CLAT entrance for 5 years integrated law courses. Therefore, it is not recommended after graduation as it will be a sheer waste of time. You can now take individual entrance exams offered by Delhi University, GLC Mumbai covered by CET, BHU or Jamia Milia Islamia, apart from other private and government universities.

Admission for LLB is on the basis of entrance exams conducted either on a national level or institute-wise. The top exams for LLB are listed here, please click this link- https://www.shiksha.com/law/exams-st-5.

Yes, graduates are eligible to pursue LLB.

According to me, BBA LLB is better than B.Com LLB because in BBA you will learn more laws related to business, which is your specialization, but this type of option is not available in B.Com. LL.B.