He was indeed clever.

"I rather see no point in taking from you. I would rather see what makes the Riddler tick. To learn you so that I can help you without hindering that brilliant mind of yours." He was no Hugo Strange, but he was not a saint either.

"Absolutely, Mr. Nygma, my guardian would not allow me to skip grades. I was utterly bored. Fair is fair." He didn't say parent, but it was enough.