JLPT N1 Grammar
The grammar tested at JLPT N1, in sets of patterns the exam deliberately puts against each other. Each one carries what it attaches to, when it is used, and the line that separates it from its neighbours — because 文法 questions are a discrimination test, not a vocabulary test.
No N1 grammar published yet. The other levels are listed above.
Practise N1
Telling patterns apart on their own page is easier than doing it mid-sentence. Sit a N1 mock test — one section at a time, or a full timed paper.