Poka_Poka
Hermione was only so impressive because her birthday is in September, past the cut off date. She had a year to study all the material.
If that was true why do people only receive their Hogwarts Letter for each year during the Summer Holidays and not on their birthday? How do they know which books needs to be on the letter if the defense teacher changes every year and chooses their own book and is only decided on during the Summer Holidays. (see Lockhart who put all his books on the list or Umbridge who chooses useless ones without magic). You know that you have a thing called brain, try using it. It's simple Logic.
No one going to even question how exactly he managed to read a full year's textbook in just 4 hours? It's not a manga, so why is no one mentioning that he blitzed through an entire book meant to be slowly gone through for a year? I mean yeah, classes tend to drag out a bit as the teacher deep dives into every subject for a week or so, but still. I had to do supplementary classes at a GED and it still took weeks of attendance to blitz through a full year's worth of reading, granted it only took a day or two to finish all the assignments cumulatively but still the textbook took a decent bit to chew through and somehow no one's pointing it out. It being a book meant for 11yo doesn't really cover it since it heavily involves magic theory which he hasn't put into practice at all yet. So either he's going to constantly refer back to it, or this is some major hand wavy bs to skip the grind!