He (Which should be El, but anyway) visto is not correct, because you are talking about someone else. Yo Tengo is correct, because you are staying that you have seen.
The correct translation of these questions are as follow:
Do you study sciences in the university? Yes, I do. Do you talk with your classmates? Yes, I talk a lot with my classmates. Do you expect to study business administration? Do you need to rest after the exams? Do you buy books in the bookstore? Do you like to travel?
