Is here any discount for student of colleage?

Yes. They have special price for students.

Get a New York City ID. It's free and give you access to a lot of free perks including MoMA membership. It's called IDNYC and you get it at the Library.

Yes, there is student discount with valid school ID. It's posted on the wall.

I will move on at Thur.

Is free on fridays

I think so I'm not sure...