If you have the feeling that you make the same mistakes again and again, listen to yourself! Whenever your teacher makes you correct yourself, take the time to think about what you said.
"Listen" to the mistake you made and picture yourself next time you'll have to express the same idea to make sure you'll say it right. That is the first step towards improving and changing.
Regularly use this kind of charts
Keep track of your progress
Often ask for feedback
"Would you like me to give you a formula for success? It’s quite simple, really.
Double your rate of failure."
– Thomas Watson, founder of IBM –