Here’s how I utilized my books when I was in class 12th(its not the one that I used but its lost somewhere in my home, so made a new one yesterday).

This book helped me a lot(a lot), to stay connected even in my classroom ;-) .
I used to sit on the first bench in the class, yet no teacher had ever found me surfing on the net in the book(I used Nokia 7710 for surfing that time).
My whole bag was investigated quite a few times in the classroom by several teachers but yet I was never caught bringing my cellphone in the school.