We have multiple examples of Deuce struggling even outside of class: it seems that he was under the impression that eggs used in cooking can become chicks, and he repeatedly fails to follow conversations during Halloween.
Deuce says that he got lost in Heartslabyul’s rose maze a lot when he first enrolled, but as of Book 7 he gets lost only sometimes (Leona: “That ‘sometimes’ is concerning”)
When forced to improvise a an explanation as to why he is in the company of Leona and Diasomnia students in Cater’s dream, Deuce says that they decided to get together for tea (Leona: “Couldn’t that idiot have come up with literally any other cover story?”)
Riddle seems offended that non-NRC students would not know even 100 of the Queen of Hearts’ rules, and Deuce admits he doesn’t, either.
Grim says that Deuce once hung up the letters to a “Happy Anniversary” banner in the wrong order.
A shop owner in Deuce’s hometown denies him entry to his workshop, suspecting that he intends to cause trouble. Ortho goes to Deuce’s defense with, “Do you really think Deuce is just acting polite in order to make you drop your guard? I promise, Deuce is not smart enough to think of a plan like that, let alone pull it off!”
Azul explains their battle against the firelotuses of Glorious Masquerade as “essentially a chess game…And who would risk their king to take a pawn in the first few turns?”
Deuce apologizes for failing to understand the analogy, and Riddle apologizes for Deuce.
Deuce might struggle with books in particular: all the books within the library of his dream world are blank, to his surprise, because he has not read any of them.
Sebek asks if he has never read a single book from start to finish in his entire life and Deuce has nothing to say in his own defense.
Ortho, however, manages to find a book that seems full of information: “Card Soldier Stories,” a collection of tales about the card soldiers who served the Queen of Hearts.
Deuce explains, “I made my mom read me those stories almost every night at bedtime when I was a kid.Once I learned to read, I kept going back to that book again and again.”
Deuce declares, “These books might all be blank now, but one day they’ll all be filled. That’s how much reading I’ll do!”
Twisted Wonderland Reference Note 