As you want to get the list of some of the best career or courses for a 12th commerce completed student with Maths so here is the information of the same for you:

Degree courses
Bachelor of Arts in Business Economics
Bachelor of Business Administration in Account and Finance
Bachelor of Business Administration in Banking
Bachelor of Business Management in Computer Application
Bachelor of Business Administration in Marketing and Finance
Bachelor of Commerce in Business Administration
Bachelor of Commerce in Commercial Law
Bachelor of Commerce in Accounting and Finance
Bachelor of Commerce in Banking Management
Bachelor of Commerce in Financial Accounting
Bachelor of Commerce in Corporate Accountancy
Bachelor of Commerce (Honors) in Taxation
Bachelor of Commerce (Honrs) in Cost and Management Accounting
Bachelor of Business Administration in Banking and Finance
Bachelor of Business Studies
Bachelor of Commerce
Bachelor of Commerce in Accounting and Taxation
Bachelor of Commerce in Advanced Accounting
Bachelor of Commerce in Banking and Insurance
Bachelor of Commerce in Accounting
Bachelor of Commerce in Applied Economics
Bachelor of Commerce in Business Economics
Bachelor of Commerce in Computer Applications
Bachelor of Commerce in E-commerce
Bachelor of Commerce (Honors) in International Accounting
Bachelor of Commerce (Honors) in Accounting and Finance
Bachelor of Commerce (Honors) in Banking and Insurance
CA
CS
ICWA

Diploma courses
Diploma in Banking and Insurance Management
Diploma in E-Commerce
Diploma in Tally Software
Diploma in Stock Analysis and Trading

Certificate courses
Certificate course in Micro Finance
Certificate course in Applied Managerial Economics
Certificate course in Stock Market
Certificate course in Accounting