u/Ill-Standard-9557

I need your help to recall the title of a fantasy book that I read when I was young, the protagonist was In a sort of "academia", related to magic, where there were also other young guys like him, there was a scene were they were playing soccer in a filed that was changing shape, or I remember another scene when a group of guys were like "teleported" in another environment like a wood/jungle to do a mission(like a training mission to catch something), it was a book with a yellow/black frontpage, I took it in a library of my town.

it would be very great if you could help me✌️