Of all persons to whom pithy lines are attributed, Mark Twain is by far the most likely to NOT be the genuine attribution.

http://www.amazon.com/Quote-Sleuth-Manual-Tracer-Quotations/...

I have never been able to verify that Twain wrote the usually quoted form of that line, "I have never let my schooling interfere with my education." (There are a lot of scholars who study such things.) I have seen one attribution of that line to Canadian humorist Stephen Leacock,

http://en.wikipedia.org/wiki/Stephen_Leacock

which to me is a much more believable attribution, but one I am also unable to verify.

Mark Twain did have some great lines about schools, of which my favorite is

"In the first place God made idiots. This was for practice. Then He made School Boards."

-- Mark Twain, Following the Equator (1903) 2:295

/pedantry