Fun Fact: On entrance exams I scored poorly on math because they didn't give me enough time. The system wouldn't let me take calculus the first year, but I could do it. So I just showed up to the class and the teacher listened, and signed my exemption to get in the class. I got an A.
If a duck is following you, it's likely a duckling that has imprinted on you or is separated from its mother. The best course of action is to gently lead the duckling towards its mother or to the nearest water source, and then quietly leave the area