Correct the sentence please.

[joham]

I'm going to leave the/my car at the garage on my way to school.

One of my teachers says this sentence is not fine. I don't know what is wrong with it. Can you native speakers help me please?

Thank you in advance.

[Anglika]

I can see nothing wrong with it. I suspect that it is the preposition "at" which is regarded as wrong, and that your teacher thinks it should be "in".

If your meaning is that you are leaving the car to be repaired or serviced by a garage/service garage, then "at" is fine.

If, on the other hand, you mean you left the car at home, then "in" is necessary.