The incident took place in the Government Girls' Senior Secondary School (GGSSS) in Yamuna Vihar on Tuesday when some students of class IX and XI and their parents allegedly held Principal Kanchan Jain hostage and damaged school property.
They had accused Jain of "deliberately" failing 90 per cent of the students in the two classes in the supplementary examination.
"The students turned so violent that the police had to lock the principal inside her office till the mob was dispersed. They even pelted stones at her office and her car following which we had to call police," a senior official at the school said.
Five people, all family members of the students, were arrested on the same day for rioting, criminal trespass, damage to property and other charges.
Also Read
Out of 817 students in class IX, 256 had passed in March while the rest reappeared for the exam, which saw only 31 of them clearing it.
"There is no detention policy till class VIII but the students have to pass the exams in class IX. While the subjects become more complex, the curriculum is vast. If they have some problems with the result they can always apply for re-evaluation or demand to see their answer sheets but this is no way to act," the official added.