Hi Kartik,
B.Com LLB is a 5 years course in which you will learn about Commerce and law together and gain knowledge about both the field's.
The course has a total duration of 10 semesters and you have to get a minimum of 50% in your 10+2 for getting admission.
Best colleges offering this course are
SRM University Chennai- 7.50 lakhs total
Chandigarh University (CU)- 5.59 lakh total
Lovely professional University, Jalandar- 6.30 lakh
Amity University, Lucknow- 8.90 lakh
Government Law College, Kochi
Amity University, Kolkata-8.90 lakh
Banasthali Vidyapith, Jaipur-4.90.lakh
School of Law Shraddha University, Graet Noida-7.70 lakh
Institute of Law, Nirma University, Ahmadabad-8.30 lakh
Hope you get it, All the best