Nihongo Shoho (Elementary Japanese) is a textbook series published by the Japan Foundation. It is widely regarded as one of the most comprehensive resources for absolute beginners. It covers everything you need to know to build a solid foundation in Japanese grammar, vocabulary, and sentence structure.
Because it is published by the Japan Foundation (the same organization that runs the JLPT), the curriculum aligns almost perfectly with the N5 level requirements.
This book is highly effective for passing the N5. nihongo shoho n5 pdf
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The Meguro Language Center (MLC) in Tokyo offers free PDFs that follow the Nihongo Shoho curriculum. While not the full book, their "N5 Grammar List" PDF is a perfect companion. Nihongo Shoho (Elementary Japanese) is a textbook series
The Japan Foundation released Irodori specifically for beginners. It covers N5 completely.
Short answer: Mostly, but not entirely.
The JLPT has changed since the 1980s. The modern N5 test includes: