There are 9 sets for Level 4, 2 sets for Level 5, and 1 set for Level 6. Therefore, we are offering a discount! Thank you for your understanding. Brain Training Homeschool Shipping included A set of problem books for the Soroban Proficiency Test. - Set Contents: Soroban Print Collection Level 4, Level 5, Level 6 - Number of pages: Problem books for each level - Purpose of use: Soroban Proficiency Test preparation Shipping is included. Thank you for viewing. We do not offer discounts. If you purchase multiple items, please comment. Prices have increased since October.