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You can refer to the link given below-
https://www.shiksha.com/college/iit-Kanpur-indian-institute-of-technology-25116

You can appear for law entrance exams while in the final year of your B.Com degree. Many law schools and universities offer admission to students who are in the final year of their Bachelor's degree programme. However, you should check the eligibility criteria of the specific entrance exams and law schools you are interested in applying to, as they may have different requirements. It is also important to note that you will have to provide your final year mark sheet and degree Certificate at the time of admission if you are selected.

You can choose economics as a generic elective subject in your course. And completing it you will also get a Certificate in economics also.