What you need to do is simple. Firstly, you need to get someone who is an experienced rider to school your pony a little bit better(no offense) and then when your riding keep looking out for the signs that they're going to buck. If their head goes down, pull it up but not sharply so you don't hurt their mouths. Sometimes it's better to kick or squeeze and then pull their head up so they are more alert and more able to listen to what you are telling them to do. Also, make sure they are not speeding up when you're not telling them too because this could encourage them to buck either out of excitement or fear. Hope this helps.
