MEC stands for maths, economics and commerce. It's an intermediate course.  After completing your 10th boards, while going to intermediate you can choose this course. There's no MEC course available in degree. MEC is a commerce course which even includes math's.
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After completing your intermediate you can go for any of the graduation course depending on the career you want and the job you want to do. If your question is something else do let us know in comment section.