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.”