Here is one of the combo exercises for save reactions on low and high shots from 9m. This exercise has many progressions and options, depending on what you want to work on.
Just keep in mind that you should always take care that your goalkeeper is performing proper technique and that you should adjust this exercise to the level of your goalkeeper.
Besides that, you can play with so many different versions of it.
Have fun and let me know how did it go? 🙂