How to get good grades without studying or trying?

I'm a good student but im very lazy. theres kids who absolutely do no studying at all and they get the best grades. there's this chinese dude in my cl (not racial statement or anything) and hes pretty cool but he puts SO LITTLE EFFORT into his work yet does it like hes the teacher. im a fast learner but i have to do some reviewing to get it right. he doenst study for tests but is the top of the cl. im talking about geometry btw.