Ethical Dilemma:an ethical challenge in an academic environment

Application for Master Program:
Describe a situation when you faced an ethical challenge in an academic environment. What was the impact of your decision on you and your classmates?
I have a thought about this essay:
One of my economics course has a Take-home portion exam, which prohibit collaborations and group work, but the exam questions are similar to the problems we did in class, and i have notes for those problem. One of my best friends did not go to class often so he has no notes for these questions, he asked me if i can lend him my notes, just the notes. But if i lend him the notes, if means i told him how to solve the exam problems, is kind of cheat. I am not sure whether i should lend my note to him. Should this be a great example for ethical challenge?