Corrections

Generation gap is the problem which existed in all times.

Adult's mentality is different from teenager's, because they are the children of two epochs with different views on various subjects.

Because of this parents and their children argue with each other, sometimes even fight.

Most of those quarrels happen because of bad marks at school, non-proper clothes, colors of hair, over-demonstrated behavior of kids: when they back home from the party all drank or smoked, when they choose wrong circle of people to hang out with.

So, saying about bad marks at school, I would assume that this little negative thing can turn to the biggest problems with communication between parents and their kids.

Every parent wants to see ideal educated child with good behavior and well manners, but children are just learning, they are in process of knowing life, so it is normally to be mistaken sometimes.

Children have different characters, ability to understand subjects, even those who are talented shouldn't be first and perfect always and in everything.

Adults should understand it.

For example, maybe their kid hates chemistry and so, this is the subject he hard to learn, but turn away he can be perfect at math and drawing, or his passing is reading or writing.

Parents need to help their kids to keep theirs head above water.

Because they have difficulties in process of the growing and studying, so sometimes those problem which seems are minor for adults, for teenagers are big tragedy.