Attention must be given to the outlook and religious customs in the house. They must be consistent with what the child is learning in subjects of kodesh in school. It does no good if the child learns Torah and mitzvot and proper moral conduct in school while behavior at home is not guided by the Torah, or if the mitzvot are done without any awareness. The trust and respect which the parents give to the teachers in the school is very important. The slightest negative comments, even off-hand and negligible ones, about a teacher or the school can influence the student in a bad way.
Every school is imperfect and has room for improvement.
It is a human construction and it cannot possess didactic abilities beyond what human beings are capable. There is no person or teacher who does not have weak points which can be used to belittle him. Any word of scorn regarding the school or the teachers will disparage their respect in the eyes of the student, and this will harm his studies. He will never again be able to respect them or admire them to the extent that a student should like and respect his teachers. Thus, a few careless words of the parents might remove the ground and foundation of learning from under their child's feet.