we had the same issue at our school, they claimed it was unfair for other students who didn't get study leaves that we get one, which didn't make sense. But since we all really needed the study leave and also saw that we got more done at home than at school we first spoke to our teachers , who eventually stood by our side and then we tried to convince the principle to give us a study leave. It almost seemed impossible but for some reason after spring break we were told that we're having a study leave after our second mocks.
I suggest you all talk to the administration or whoever is responsible. maybe involve your parents.Good luck!