As remarked above say to essay test,
I agree with this.
First , essay test is good to explain your idea by a declarative sentence.
Because essay test evaluates student's viewpoint and understaning about writing.
For example Inha University's essay test evaluates summary and understands of writer.
Second, essay test can subjective to each student, so that is advantageous to student.
Because subjective assessment can make the most of student´s characteristics.
For instance when I write essay test, I can express my own opinion instead of uniform answer.( Yes or No etc.)
Third, essay test can confirm student's own ability easily.
Because that is not uniform answer, short answer and can't copy someone else's writing.
Give a concrete example, if essay test's topic is "Smoking in public place is just or unjust ?",
you should choose one of the two and explain why you choose this opinion in details.
All right, Don't you agree this opinion now ?