He studied hard so that he could be admitted to the university.

In order to go to college, he studied hard.

He studies hard so that he can go to college.

These two sentences have the same meaning and are both right.

The difference is that the adverbial phrase in the first sentence is to do something.

In the second sentence, there is an adverbial clause

Please remember to adopt ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ when you are satisfied.