how you know if a boy like you
Dont take tension. If he likes u,he will come and talk to u. And to make him more confident in his approach,even u should signs from your side.like smile,wave,always look at him
You ask him.
He will treat you differently from other girls. He would make an effort to get to know you, and spend time with you even if its just studying.
He will give you signals which are winking,eyebrow raising, and being nice to you! :)