This essay is organized well, and the student devoted an appropriate amount of time and effort. The English is pretty good, and it is always understandable. The spelling is good, and the student made a gallant effort to come up with three reasons to agree.
The most serious problem is that the student has missed the point of the prompt completely -- not that it is entirely his fault if it was printed just as it is here.
The prompt says:
Topic: Agree or not? Schools allow students to learn at least one course of culture of the country
rather than their own.
The prompt should say:
Topic: Agree or not? Schools should allow students to take at least one course in the culture of a country
besides their own.
The student has misinterpreted the prompt to mean: Should schools offer a course in culture, or should students have to learn this on their own?
But what it actually means is: Should schools offer courses on the culture of foreign countries?
Student or Learner