Hello Aspirant,
Bachelors of Commerce is a 3 year undergraduate program generally consisting of 6 semesters. You can apply for common admission Test (CAT) in your final year of graduation and not second year. So you can fill the forms in 6th semester of your graduation if you want to give CAt. Check the following link for complete details on CAT eligibility criteria:
https://bschool.careers360.com/articles/cat-eligibility-criteria
Good Luck
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