35 students in a classroom built for 20 in the 1950s
No air conditioning with temperatures in the 90s making the temperature inside the classroom well over 100.
Cant suspend students until multiple documented infractions have happened over a long period of time.
That same student will destroy even the greatest teacher's lesson EVERY DAY and affect EVERY student's ability to learn around him.
Pepper in that more than half the class cannot speak English fluently.
Yeah, pretty fair to judge a teacher's performance with conditions like that.