Hi there Habib Rastegar. Your essay it's not bad at all, but I've found some mistakes.
When lazy educators see the clever students, they unconsciousnesswan to compete with them to increase their knowledge and their social status among their classmates.
Unsconsciousness is a noun, and means "loss of consciousness". I think you wanna say "unconsciously", an adverb, which means "lack of awareness or intention"
You forgot a "t" in that verb form,
want .
Students whom with low intelligence can attempt hard and hard to increase their knowledge by paying attention to their own professors and performing their assignments and projects duly.
You need a gerund after a cause clause introduced by "by".
For instance, I have a friend who he poor and he had to work all the day to pay his tuition and buy his school books at high school
You need a verb there; replace that pronoun and put "is" or "was" instead.
They have to be allowed to enter the college and university to increase the scientific level of their own country
They maybe kill themselves because they are not successful in their scientific fields .
There are not only scientific degrees like Medicine or Engineering, but also Arts, Law, and so on. And they are important as well, so you can include them too.
Those are the major mistakes I've found, I hope it will help you a bit ^^