Hello Aspirant, Hope you are doing good.
There is 5 year integrated llb course , which is after 12 th and 3 year LLB course which is after graduation.
As you said you are in b.com 3 rd year . You can pursue LLB (Bachelor of legislative law) which is a 3 year course.

LLB programme eligibility requirement are because the 3-year LLB is a law course offered after graduation, candidates seeking a law degree must have graduated from a recognised institute in any discipline such as BA, B.Com, B.Sc, BBA, BCA, and so on.
Minimum qualifying exam marks vary by college, with some requiring 50 percent and others only 45 percent. Furthermore, in the case of public law colleges, there is a relaxation in minimum marks for candidates from reserved categories. There is no upper age limit for the course.
There are various entrance exams to get into LLB National wide exams, state wide exams and University level exam.
Like DU LLB, BHU UET, LPU NEST,BVP CET Law, LAT , Christ law entrance test, and many other exams .
The students pursuing an LLB degree will study subjects like labour law, intellectual property rights, corporate law, family law, criminal law, human rights, and international law, etc. The duration of the course is 3 years, with most colleges these days dividing these three years into six semesters.

For more details you can also visit the link given below:
https://www.careers360.com/courses/llb-bachelor-of-legislative-law

Hope this information helps you.
All the best.