Hey Harshita,
Bcom or Bachelor of commerce is a three year full time graduation course divided into six semesters.
Admissions for Bcom in MCM are centralized from PU i.e Panjab university. So, PU will decide your college on the basis of your marks in 10+2.
So, it is not sure that you'll be getting this college.
If you want to take admission in this college itself you can only take in BA as it is Non Centralized.
Minimum Eligibility for the Bcom in PU is 50% marks from the recognized board or Institution.

Dear Harshita,
Bachelor of Commerce (B.Com) is a full-time three-year undergraduate degree course offered by the Panjab University, Chandigarh.
A person, who have passed Higher Secondary/Intermediate (10+2) any other examination recognized as equivalent thereto, shall be eligible for the course.
Last date for Online Submission of Admission Forms for all Centralized courses is on 23 June 2018.
GOOD LUCK !!