Asuma was using cheat books, which is why he is our wikis background. He is known as the only anime character to ever use cheat books so often, that he died for it, which is a big thing since he was such a pleb and used cheat books.
DONT USE FUCKING CHEAT BOOKS YOU LOSER.
(P.S. M60 also uses Cheatbooks, here is proof via a quote: "I'm using Cheatbooks..." - m60, Twitch Streamer gone Twitch Cheatbooker.)