I read it when I was hospitalized in 7th grade. The protagonist has mismatched eyes and he was told by his mother that he got it during a surgery when he was born.
He thinks he is about to go to a boarding school and when the driver comes to pick him up, the driver drives the taxi super fast and that thing happens where you're going so fast that it feels like you're in a blue tunnel or something. When he reaches his school he realises it's a spy school. Surprisingly he's super good at being a spy.
in one chapter they were given an assignment by their teachers to hide a disc that had been given to them when he switches the light off and he'd search for the disc after turning them back on. Every one in the class was found (with one girl slowly turning the disc to make it invisible but it falls after a certain point).
The only person who doesn't get caught is the protagonist as he hid his disc on the teacher himself. The protagonist also realises that he's really good at gambling and reading people during card games
Also idk if this is important but the book mentions a lot of ravens. I cannot remember if the ravens were actually there or just raven statue. And also I think the statues in the school move?
The protagonist also sneaks out of school or something to spy on his teacher if I remember correctly Also apparently there are this one species of people(?) that have different colored eyes and it happens to be their rival school or something. That's why the protagonist gets bullied a bit because they don't trust him.