I was googling to see how the verb graduate is used.
graduate college or
graduate from college. and I got my answer to this in an article about this:
Did you catch that ugly grammatical blunder? The problem is with the verb: graduated. In this context, it should always take the preposition from.
Graduated from. You don't graduate college. College graduates you. You graduate from college.
However I couldn't find anything about completing study of some field and not college or highs school. Is it used the same? like this:
I have graduated from Computer Engineering.
or is there another verb to describe completing a field of study?