求翻译：这样的嗜好导致他的学习成绩并不是很好。可是并不能说他不聪明，他也有考的很好的时候，好到所有同学和所有老师都意想不到。所以我相信，只要他改掉这样的毛病，他一定可以做到最好。但这个习惯目前来说是不容易也不大可能改掉的。是什么意思？

This hobby led to his academic performance was not very good. But does not say he is not clever, he has very well when well to all students and all teachers are unexpected. So I believe that as long as he got out of trouble, he will be able to do the best. But this habit is not easy now is unlikely to get rid of.