Nerd cheat

If you have a friend that really smart and he/she trusts you and you trust him/her, ask for answers. If he/she is far, (and if you have the guts), sneak without the teacher looking. This method is the riskiest of them all. If you want to lessen trouble, use mouthing or something to communicate to your friend if they are far and easy to get seen. Also use other types of signals to contact them.