This book explains the "Language Knowledge (Vocabulary/Grammar), Reading, and Listening" sections featured in the Japanese Language Proficiency Test(JLPT) N1 in Japanese, English, Chinese, and Korean. The supplementary CD includes listening exercises.
I found some explanations a bit lacking and some translations were pretty bad, but, all in all, it is a great book to get ready for the test. I guess I'll know its real value if I pass the test next week.