CITY Montessori School not giving winter vacactions, what to do?

(First time posting something constructive) i am from the CMS, Kanpur road branch, and this is just torture, For context I am from class 11th and have studied in this school for a long time. They had been cruel and conservative about giving holidays but not so much that they aren't giving any. first their all famous annual function and provided us no holidays whatsovever (We are regular for 2 3 months) and then on important dates they keep "Monthly TEsts" and then they cancel it saying it would be conducted on the next day just to maintain the attendence Now they are not even giving winter vacations holidays, Even 25th December is open Most probably Is there anything I can do other than missing an entire week of school by being deliberately absent?