I just took the "Presidential Deathplaces" quiz on Mental Floss and scored 8 out of 10. Which is not bad, especially given how complex some of the questions were.
One of the questions isn't really about presidents at all - it was about which college was located in a city where a president died, and I guessed wrong. Ah well. The other was listing how many presidents had died in Washington DC, and I forgot two - one I should have known and one I didn't realize had died there.
As you may have noticed, I kept my mistakes somewhat vague so as not to spoil the quiz for you. Give it a try and tell me how you did!