I don't know... some of those answers showed some ingenious sarcasm!
And some ingenious manipulation/engineering.
The kid(s) thought: "There's no work anyway, and with answers like this they'll hold me back a grade... or three, and I'll be able to stay on at school a few more years. Dad did say school years would be the best of my life, so why not make the most of it"
A teacher wrote on one of my report cards something to the effect of this: "Mark knows the answers and would excel of only he would apply himself. However, he persists to act the fool, if only to prove to his peers he is an under achiever. If he does not pull his finger out next year he will certainly leave school with a backside like leather, as the cane appears to be the only language he seems to understand of late."
He was right about one thing... I did leave school with a somewhat toughened rump, though my grades in subjects I liked were not too bad. I didn't get straight A's but I got 3 or 4, and quite a few B's... a distinct improvement on the F's and X's of previous years.