What a 6.5 sounds like
Do you study or work? — I am a student. I study civil engineering at university and I am in my third year.
Would you change your major? — No, I do not think I would change it. I chose civil engineering because I was good at maths and physics at school, and there are many job opportunities in this field. So I am happy with my choice.
How much time do you study each week? — It depends on the week. Usually I study about twenty hours a week, but before exams I study much more, maybe thirty or thirty-five hours.
What would you change about your school? — I would change the library, because it is very small and there are not enough seats for all the students. Also, sometimes it is too noisy to concentrate there.
Why it scores what it scores: This is a solid 6.5 and the study-hours answer is genuinely good — a real number with a qualification attached, exactly as the tips ask. What keeps it from going higher is the hypothetical question. Would you change your major gets a flat no with the reasons for the original choice, which is the commonest way to fumble it: the conditional is never actually used, so the grammar the question was designed to elicit never appears.