Change the narrative style by using direct speeches.

"Have you learnt your lessons?" father said to Arman. "No, I've forgotten," said hE- "That's very bad. You must be more careful about your preparation for the examination. By doing so, you can make a good result," said his father. "Thank you very much for your timely advicE-" 

Father asked Arman if he (A) had learnt his (A) lessons. Arman replied in the negative and said that he had forgotten. Then father rebuked him saying that that was very bad. He added that he (A) had to be more careful about his (A) preparation for the examination. His father further added that by doing so, he (A) could make a good result. Then Arman thanked his father very much for his (F) timely advicE-