MCPD Exams and retyping all the code?

I'm training for the MCDP and the courses are using the Microsoft Press books. Theres many Labs within the book but the book also comes with all the completed code for the labs. Should I be typing out all the code or is it acceptable to just run the code provided and step through it?
Comments
But as said it depends if the code is complex or as easy as A B C to you.