With a shuffling gate, he made his way to the head of the class.
Given the nature of the second part I wondered if it was supposed to a 'shuffling gate' or 'shuffling gait.' If it's the latter do you mind if I pinch the idea of a shuffling gate for my own use?
The first part with all the O's and A's kind of snuck up on me and broadened as I reached the end. Which means that at first I didn't find it funny at all but as it went on (and on) it became funny. Kind of a not so subtle weave of subliminal humour.
The second part is excellent, right off from Professor Fumblepaws, in fact I'll write that again 'cos I liked it so much - Fumblepaws.
The poem, changed since Keith's comment, the blunt, almost nonsensical, but not quite, repeat of the end line works well, don't know if it was a quick repair or intentional but seems o.k in with the story.
All the best