To be a good parent is significant for our family and society.
.... This sentence is pretty weak as an idea. May be you have not expressed it properly. Better re-phrase.
This raises an arguable issue whether it is beneficial to enlighten young people to be good parents in school.
.... This is a good sentence.
In my opinion, it is negative as it is not only the school cannot pay focus on individual properly but also the parenting has more benefit for young people to learn how to be good parents.
This one is too very long and has several issues regarding clarity :( ....Make a simple statement that expresses your opinion clearly.
On one hand, it is not a good idea to teach youth to be good parents in school due to the concentrations beyond on every student.
.... what do you mean by "concentrations beyond on every student"?
You need to pay more attention to clarity of your sentences.