Bal Bharti Public School — failing most of the students in 11th class without any reason

Address:

Jhajjar, Haryana, 124507

Sir, bal bharti public school bahadurgarh are failing my sister as well as 30 or more brighter students in 11th class without any reason. My sister scored 9.2 cgpa in her 10th class and in 11th standard they want only topper students. They are saying that "this is cbse rule to fail those students who are failing below 33% overall in a subject in complete year", but it is not true cbse says that only those students will fail who have scored less than 33% in overall subjects only in external exams (Not internal) and my sister scored 40 in maths in external and they give compartment to her. When we said to show her exam sheet then they denied to show any exam sheet. Teachers are failing students with their peraonal problems to students and no other reason. As well as they are giving passing certificate to toppers or rich and powerful peoples by taking bribes.
So i request you to please concern my views with your respected authority.