According to the conversation, Mr. Johnson is NOT very strong in

W: Good morning. Sit down please, Mr. Johnson.
M: Thank you, madam.
W: I have read your letter here. You seemed to have done very well at school. Can you tell me something about your school work?
M: As you can see, my strongest subjects were arts subjects. My best subject was history and my second best was geography. However, my favorite subject was math, and the results I got in the math paper were quite reasonable.
W: That’s true. Now, can you tell me why you think these subjects will help you in this job?
M: Well, madam, I understand that you manufacture computers, prepare software, and advise clients on how to use them. Is that right?
W: That’s right.
M: And I’ve been told that working with computers needs a logical mind rather than great skills in mathematics. That’s especially true, I believe, when it comes to writing programs. So I think my results show that I have some ability in logic and in mathematics as well.
W: So, you would like to write material for computers, would you?
M: Yes, madam. That’s what interests me most about computers - writing programs, but I think the computer industry itself is still expanding enormously. I’m sure that career prospects in the industry would be very good no matter what sort of job I went into.
W: I see, well, thank you. I’ve enjoyed our talk. We’ll be writing to you.
M: Thank you, madam. Good morning.