The worst thing at school are boring lessons, as you cannot get away from them, you are forced to spend 45 minutes listening to somebody talking about a specific topic. Sometimes this topic could be interesting (chances are 1 in a million but never say never). There are some basic ways of getting to do something interesting but some other ways could be extraordinary.
First of all, drawing is the safest and most well-known way of not being bored in a lesson. Most people enjoy drawing in class , as they could co-work with a friend of them in an art piece. Many people might not be good at it , but who cares as long as you enjoy what you are doing;? It isn’t anyone else’s business.
Secondly, of course you could talk with your friends via paper(writing) or by talking. Talking is a more dangerous way , as you could get suspended from your lesson so I would recommend writing on a paper, unless you don’t care if you get suspended or going to the principal.
The most extreme ways of making time pass in a boring lesson is having an mp3 player and earphones (wireless ones are better), transferring your favorite movie or music album and listening to it on the lesson, but be careful not to have the sound too loud or having a body posture that will make the teacher come next to you and check you.