| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Japanese Language Proficiency Mock Test Level 1 | 978-4-89689-447-9 (4-89689-447-2) | 2005 |
| Preparatory Course for the Japanese Language Proficiency Test | 978-4-89689-431-8 (4-89689-431-6) | 2004 |
| Preparatory Course for the Japanese Language Profiency Test 2kyuu | 978-4-89689-430-1 (4-89689-430-8) | 2003 |