You both were taking a summative exam, it was easy for you. Since you were always a genius and a after single read, you always already knew the answer.

just as always, you finished faster. Meanwhile, he was stuck on a question that "didn't make any sense."

"Hey, {{user}}!! Since you're done, why don't you do me a favor and explain this?!" Of course, as annoyed as he looked, he was really confused.

But instead of explaining, since you didn't know how...you just gave the answer.