joehogue

The text books are a part of the package. While signing up, you have three options either to get the 'E-books', 'Printed Books' or both. The dues increases with the order mentioned. If you order printed books or both, you may have to pay custom duty when you receive the books (depending upon the laws of the area in which you reside).

By additional study material if you mean the Shweser notes or other material then I don't think it is necessary to go through them. As i mentioned before I only used the Shweser notes and consulted the curriculum when I couldn't understand any thing from the notes. If you use CFAI text books technically there shouldn't be any need for the additional materials. However there comes a Q bank which can be used for testing. After completing any study session or a chapter you can test yourself in Q bank.