I can't find a copy of it online :(
But I recall it being pretty funny (when I was 10).
( The Teviot Moose major 5th., Thu 10 Sep 2009, 15:19, archived)

Although I did find this :)
www.poemhunter.com/poem/the-lesson/
( The Teviot Moose major 5th., Thu 10 Sep 2009, 15:23, archived)

i found this
literarytourist.wordpress.com/2008/02/12/being-a-slow-reader/
( sleepybinky, Thu 10 Sep 2009, 15:42, archived)

apparently its allan ahlberg, too. not roge.

( sleepybinky, Thu 10 Sep 2009, 15:43, archived)