1. Her hope is that she can get a good mark in maths.
2. What she hopes is that she can get a good mark in maths.
3. It is her hope that she can get a good mark in maths.
但是,不可用wish一词,因为该词表达的是一种愿望,实现的可能性极小。关键是wish要用虚拟语气:can应为could。“取得好的分数”也可以说:get good grades/achieve good results等。此外,math需要加上s。这个解答不知你满意否?
(刘永科老师 回答)