While taking a written exam at college, we can't ask an instructor every time we don't understand a question on the paper. It would be unfair for hearing students who can't ask while deaf students can with a terp present during the exam. If one doesn't understand the question, he/she has to skip it. It's the students' (deaf or hearing) responsibility to study before the exam. That's what colleges are all about.
I am sure that students with another kind of disabliity such as Cerebral palsy get extra times.