Central Board Of Secondary Education [CBSE] — complaint against teacher

The teachers of sanskriti kmv school are not good as expected, the school
Teachers do partiality and gives less marks to the student who haven't kept tuition to them. The teacher don't even tell the mistakes and make an excuse that the answer is not appropriate or not upto the mark you must right more. If they don't like any student they give less marks to that child while checking answer sheet. The tution run by those teachers make out alot of money by it that is they use to take 3500 per month. First they fail or give less marks to that student then tell that particular student that you may join tution because you are not able to do by own anything and then they demoralised that student. So, it's our humble request you to take some action against those teachers