Hello Sifna Suneer !

For calculating Index Marks follow this process :-

Marks obtained in Part III Optional at +2/equivalent exam less handicap marks plus a weightage of 50 marks in each of the three subjects of Commerce combination subject to a maximum of 150 marks plus bonus marks if any. The optional subjects concerned under Part III will be Commerce, Commercial Correspondence and Commercial Geography, Accountancy, Book-Keeping and Accountancy, Economics, Life Insurance and Salesmanship, Banking with Secretarial Practice, Business Studies, Mathematics, Computer Science/Computer Application, Informatics Practice, Management, Informatics Practice & Management.

For more information you can visit  this link :-

http://cap.mgu.ac.in/ugcap2019/docs/UG%20Prospectus.pdf