I give a 4/10 because J.K. Simmons performance and good music.

Otherwise, it's a film that is neither realistic nor credible.

It is obvious that that has been written and directed by a young director, as consistency conspicuous by its absence: since the dramatic and exaggerated concept has been put ahead to good sense and tact.

All the drumming-bleeding scenes are misplaced (nobody bleeds as a result of playing drums), as well as the attitude of students to a teacher who is totally unbearable: chairs crashing against the wall, insulting and disrespecting them constantly .... which students replies with an incredible: "yes, sir!" as if they were in the Army ... Today, i think anyone can't put up with that kind of attitude unless you have a very low self esteem.

4/10