Hi,

MEC stands for Mathematics, Economics and Commerce. Basically, it stands out for the commerce stream and you can pursue many good courses after this stream. Some of them includes:

• B.COM (//B.COM) (Hons)
• B.COM (//B.COM) LLB
• B.COM (//B.COM) (General)
• BBA
• Bachelors of Management Studies
• Chartered Accountant
• CS

You can get the whole list of courses over here: https://school.careers360.com/articles/courses-after-12th-in-commerce

You need to choose the course by seeing your interest and keeping the factor that what you want to become in future.