Sometimes I finish math finals too quickly, and I spend two and a half hours checking answers, again and again, until the instructor comes in and announces closing time.
Yes, checking work is boring, but why not use every minute they give you?
I usually don’t find mistakes.
And I enjoy being correct. Such neat calculations! Such flawless execution! Sometimes I’m surprised by my own correctness. A part of me forgets that I was the one who wrote these answers not too long ago. Certainly the person who solved these problems (me!) must be a brilliant, peerless god among men.