Help understand comma

Goodnight, I’m having trouble understanding why a comma is place in the following sentences

I am Sally Lims, a senior at LM high.

I am Sally Lims, the class President.

I am Sally, a fourth year student, vying to your class President.

Would it be incorrect if a comma isn’t place between student and vying.

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Hi Neisha, welcome to our forum. I’m afraid your sentence doesn’t make much sense. Where did you find it? Who wrote it and why?

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