Как правильно перевести на английский язык фразу: Я умею сидеть верно

Я умею посиживать верно на уроке. - I can sit properly in class.

Our lessons usually start at 9 oclock in the morning. I always come 15 minutes earlier, in order to repeat my lessons. I have many friends in school and we are very friendly. I follow the rules in classroom and I can sit properly in class. I always get good marks and I always ready for the lesson. My lessons finish at 2 oclock and my friends and I go to park and have a walk. Then, I go home, have dinner and do my lessons. In the evening, after finishing my lessons, I watch TV or play computer games.