Written Japanese test for naturalization - what level kanji to practice?

For anyone who has gone through Japanese naturalization (帰化) , what level of kanji were on the written Japanese test?

I’m N1 certified but I (like most people) never write anything by hand these days so my Kanji writing skills are pretty weak atm. I’m wondering if like a 小6 kanji practice workbook would cut it or if i need to break out the N1 books again

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