hi. bastian. here my suggestions and comments which i focused on your first two paragraph. keep writing. thanks
pay attention of the form of word (adjective, noun,or adverb)
concern about the using of proper word
Nowadays, fully concentration concentrated in attending the class is extremely AN arduous TASK for many students. There are two possible factors both inside and outside internal and external which give rise to this problem. I personally argue that school educational institution and parents should address this issue.
Two reasons
bringing about why children
who are not able to pay attention in the
learning class room are
inside internal factor and
outside external factor. Firstly,
inside factor is which comes from those children them selves. This is because they are lack of nutrition. This condition will lead to less concentration in the class.
better to explore more your idea by mention why lack of nutrition will cause the concentration of childrenSecondly,
outsidefactor is consideration caused by others. For example, some students do not play sophisticated item at the class when their educator is explaining the lesson. This phenomenon is occurred in various schools.hard to follow. it contradicts opinion too as you said that 'student do not play sophisticated item at class' which more likely as a solution. in fact, in this paragraph you should reveal the reason