This series is developed based on five years of research analyzing the New JLPT test papers. Structured as a five-week study program, it includes Vocabulary N1 and Grammar N1, each containing five core units plus a special unit. Both books are accompanied by a memory booklet for enhanced learning. Units 1-5 provide detailed explanations of N1 vocabulary and grammar, while the special unit systematically compiles knowledge points that have appeared in previous exams. The memory booklet further supports revision through categorized summaries of key content. Additionally, 1000 Questions on Vocabulary N1 covers all six question types in the vocabulary section, offering a total of 1,000 exercises organized into a 35-day practice plan.