Hello

Congratulation on completing your graduation.Yes you can do Law course like LLB after your B.com (//B.com) .There are many colleges offer 3 years LLB degree and you can check their entrance exam on https://law.careers360.com/exams .

However,you can only do UG course after B.com (//B.com) because for doing PG like LLM you compulsorily need LLB degree.

Hope It Helps

Best Wishes For You!