Can someone please explain to me how to use the equations for projectile motion?

Ok. so, I was gone the whole week that my physics teacher explained about projectile motion. The test is tuesday, my grade in that cl is failing, dad's gonna flip if I don't get it up, and the marking period ends thursday. we are talking about projectile motion. I don't understand what the equations are, what equations to use when, and how to use them period. can someone please help me?