If you've taken this class previously, write yes, and describe some of the stumbling blocks you had. If you have not taken this class before, write N/A.
Work Step by Step
Consider some of the things that might have prevented your success in this class in the past. Sometimes people have bad luck, sometimes you just have a bad term, or sometimes you can change what you're doing, such as by managing your time better, using resources (See question #7), studying more effectively, etc.