is it worth reading before my exam?

Eh it kinda aged like milk

Expired milk

Before your exam, no not the best idea.
After your exams, I'd say do whatever you want, just don't read the comments and enjoy the story as you deem fit, it's not bad and can be a very fun read if you ignore plot holes and such.

Nah, lol the story started off good but its turning worse every chapter. You will lose brain cells