写篇英语小短文介绍一个亲人,说他以前的状况及现在的变化（关键用比较级,这短文是在比较级那单元后出的)在线等答案

My brother was a naughty boy before .When he go to high school this year,he makes a difference .
He is more hard than before,and he is more careful than before.In the mid-examination he gets a very high score ,so he is a better student than he was be.
I think he can do better in his study.