I would really like to injure my ankle so I don't have to go to school please no answers like don't do it or it will hurt because I'm going to do it any way so pleas could you tell me how to do it preferably a sprain xx

HA! I fell down some marble steps in about 1975 and sprained my ankle enough that I couldn't walk except on crutches for a while. Guess what? IT STILL BOTHERS ME, almost 40 years later. And it's thicker than the other one.
And why do you think a sprained ankle is going to get you out of school? It didn't get me out of work.
And last - whatever you arrange to sprain your ankle could very easily result in much greater injury too. Broken arm, broken leg or foot or ankle...

Sorry, there is no way any of use will help you injure yourself.

However, if you tell us why you don't want to go to school. We may be able to help with that.

I agree with Scott.

Now way we'll tell you how to injure yourself. Think about it, would that be responsible? Would that be moral? Of course not.

So, why don't you want to go to school? What's going on there that you're willing to injure yourself in order to avoid it?

Also, you do realize that even with a sprained or broken ankle, you can still go to school, so your plan really won't work.

If you were in the military and got caught pulling a stunt like that, you would be branded as a coward (not to mention a whole list of penalties depending on circumstances). Then what do you do the next time something is coming up that you want to get out of? It's a bad habit to start.
Are you being bullied? Lay out your reason for wanting to stay home tomorrow. There are a lot of intelligent, experienced, caring people here who will help you deal with whatever it is.