An exam?
No one here can tell you what exercises will help with a generic exam.
You can use Google to look for Excel Exercises. Likewise Word.
Are these Microsoft Certification exams?


I am a fan of Udemy and Linked-In Learning video courses which have lots of exercises but which are not free. Although if she is attending a school that gives her and .edu email address, the school may be paying for the Linked-in courses.


There are good videos on YouTube for Excel. I'm a fan of (4) Leila Gharani - YouTube.


Default Templates in Excel - Easy Excel Tutorial