Learn English – the difference between “Must” and “Must be”

meaning-in-context

I saw the following sentences in an advertisement.

I want to know the meaning of Must and Must be and the difference between them.

*Graduation is must.

This is simply not grammatical. The correct version is:

Graduation is a must.

Then for:

Graduation must be in computer science.

This means that if you graduate, it should not be in anything else than computer science.

I don't think that is what is actually meant - I assume that what is meant is this:

Graduation is a must in computer science.

Graduation is a must-have in computer science.

Meaning that when you study computer science, you must see it through to graduation.