Why is my government teacher so generous on my part?

One time, I did not finish all of my homework. He still gave me a 15/15 on it… On a test, I did not answer everything on the short answer… Still gave me 5/5 on both… When I see others’ homework, they answer all their questions on their homework… some don’t get full credit for the wrong answers… and they give more of an answer on the short answer questions… they don’t get full credit because of the parts they get wrong…