He screwed up one part of chemistry test

Today is Day1, I went to his chemistry class as usual but he had a test. It was a long test and it was hard. I know it because I had done a similiar test last year.

It was weird to wait him in the class (My. Pattyson will make fun of it), so I went out the classroom and waited him at the stair. He can't found me after he had done the test because I went home almost the same time as he done.

Actually, it is possible if I go back to check Mr. Chen's room, I probably would see him. LOL does not matter.

sorry......