I often see or hear this.

Problem:
The preposition “from” is missing.

Explanation:
High schools and colleges graduate people; people don’t graduate high schools and colleges.

I also believe that omission of the preposition “from” helps to prove my “Devolution toward Simpler” linguistic hypothesis. It is simpler to say “graduated” than to say “graduated from”.

Solution:
“He graduated from college last year.”