Your coach will conduct mock interviews focused specifically on areas you may need more work in.
I would give my coach a 4.75/5. He was very good at making sure each interview was scheduled according to my needs, and I felt much more confident in my interview. In the short amount of time we had, we were able to work through a good amount of problems, and he chose the ones that exercised my abilities for thinking problems through.
I would use Exchange again, and I would definitely recommend it to a friend.
Overall I found my Exchange experience very helpful and encouraging. My coach was excellent, he identified my strengths and weaknesses correctly. He also suggested hints during the interview which steered me in the right direction. The problems were also well chosen to determine my skill level. I would recommend him to others and I got a lot out of just one session.