Hello,
Yes you are eligible to take admission in b.com course even after completion of class 12th board exam with pcm.You should try to search out top colleges for B.com course if you are interested in this course.This course is of 3 years of duration.
Hope this helps!
Good luck.

Hello Komal,

Greetings

Yes dear, you are eligible for taking admission in B.com even after completion of 12th with PCM. Science is the only stream where you can have three options for taking a UG course. You can stay with the science stream or you can go with the commerce or arts stream. It depends on the likes and dreams which you want to fulfill in your future and interest.  As of now you want to get admission in Bcom. So these are the details regarding the course.

Course Level- Undergraduate
Duration- 3 years
Examination Type- Semester system
Eligibility- 10+2 from a recognized educational board
Admission Process- Merit-based
Course Fees- INR 10K to 1
Average Starting Salary- INR 1.8 lacs to 8 Lacs
Top Recruiting Areas- Banking, Media, BPOs, Tourism Industry, Hospitality, FMCG Telecom etc
Job Positions- Auditor, Business Consultant, Budget Analyst, Finance Manager, Finance Analyst, Stock Broker, Chief Financial Officer, Cost Estimator and others such.

Bachelor of Commerce degree is designed to provide students with a wide range of managerial skills, while building competence in a particular area of business. It imparts candidates with knowledge in accounting principles, export and import laws, economic policies and other aspects which impact trade and business.
Also, some of the best colleges which you can go are:

Loyola College, Chennai

Christ University, Bangalore

St. Xaviers College, Mumbai

Madras Christian College, Chennai

Sri Ram College of Commerce, University of Delhi

Lady Sri Ram College for Women, University of Delhi

Goenka College of Commerce and Business Administration, Kolkata

Wish you all the best for you future!