Anyone Know a Horror Book Named "Classroom" or Something to That Affect?

Hey all

I was at Barnes and Noble the other day and another shopper recommended a book to me called "Classroom" or "The Classroom" and it was in the horror genre.

I cannot for the life of me find this book online. I've searched everywhere. I only remember the description being that the teacher really loved their biological (?maybe Idk) child but the class kids killed her kid? I think that was the synopsis on the back.

The cover was an eerie classroom aesthetic and I remember telling the guy it was giving backrooms.

Any ideas what this book is or who the author is? I wish I took a picture but its killing me not knowing.

Any help would be great. Thanks!