Why is the woman able to give Harry so much information about the job? [original

W: Hi, Harry, are you waiting to see Professor Jamison, too?
M: Yes, since I got one of the five highest grades in her managerial economics class, she asked me if I would be interested in working as her assistant next semester, I’m here now for my interview.
W: Oh, yes. (1)I know all about that job. I did it two years ago.
M: Really? Did you like it?
W: I think it’s the best job I’ve had in school. It paid 8 dollars an hour, which was 3 dollars more than I got working at the school office the year before.
M: Wow! That is a good salary. What did you do?
W: (2)I was in charge of grading all problems sets that were assigned as homework. I never had trouble doing it and of course, Professor Jamison was always available to help me if I had any questions.
M: I think I’d enjoy doing that sort of work. It would be very good experience for anyone thinking about becoming a teacher.
W: Absolutely. You’ll also learn how to use the computer data base because the records are kept on it and build up your computer skills as a good preparation for lots of jobs.
M: (3)The job sounds great. But I’m a little worried about how much time it might take.
W: It’s pretty reasonable. It never took me more than five hours a week to do the grading and then another 30 or 45 minutes to record the grades on the computer.
M: That sounds manageable. I guess you can do the work when it fits in to your own schedule, too, can’t you?
W: Oh, yes. You can do the grading in your room or in the library. You just need to get each set back for the next class. But that means you’ll always have at least 2 days and sometimes 4.
M: It sounds great.
W: Good luck with your interview.