I read a story by someone who had experienced a situation where the discrepancy between the actual situation and the imagined (hoped for) situation has led him to be in an impossible situation of trying to do his job.
Should he let go of the job, and lose money? Should he stick around and keep the lie alive? Should he try to assuage the employer/parents to reduce their expectations?
The first thing he should get answered is how this situation came into existence.
It starts with a little lie, the boss is trying to keep the students in school, so to keep the parents happy, he wrongly informs them of their ability to perform. Parents do not have the ability to even guess to how far this information is correct, and since believing is easier, keep insisting everything is alright.