(Is there a word for "to make it shorter, to say what you want to say without saying too much"?)
I think you mean, to write concisely.
There is a greater chance of winning for a person who had a better head start.
You can write either "head start" or "better start." You don't really need both.
That is why children need to get used to competition as early as possible, due to the fact that they have to face that eventually.
Get rid of either "that is why" or "due to the fact." They mean the same thing, you don't need both.
a high school student
who committed suicide
and develop
ing interpersonal skills
when debating
on how
Innovative ideas can be generate
d and time can be saved simply through cooperati
on.There isn't really a point in saying cooperating with others since that is more or less implied (you usually don't cooperate with yourself)
As MissS1987 mentioned earlier, you seem to switch positions
I tend to believe that a little competition is needed
it is more realistic to teach them how to interact and socialize with others
I think you can use a bit more elaboration in your body paragraphs. You can have another one to address an extra point.
This is looking pretty good :)