Dear,

Basically, B.Com in Taxation and Finance is a 3 year (UG)  course in the domain of commerce .The minimum eligibility criterion which most of the institutes ask for is a score of at least 50% at 10+2 or equivalent level.Majority of the Universities/Colleges conduct a common entrance test for admission into B.Com. Courses (like GITMA) or take admissions through commonly held entrance exam like BHU CET. Hence students would have to make an application for such exams.You have to qualify these exams in order to get admission in the course.So, it depends o your college. If you specify the college, I could help you better with the percentage required.

Hope this helps!