N5 in three months from a genuine standing start is realistic for most adults studying about an hour a day. It is the most achievable target in the JLPT ladder, and it is a good first milestone.
Here is the shape of the twelve weeks.
Month 1: the script and the first 300 words
Weeks 1-2: hiragana and katakana. Both, properly, before anything else. Every additional week spent in romaji makes the transition harder. Learning hiragana and katakana give a workable schedule - about ten days each if you drill daily.
Weeks 3-4: the first 300 words and basic sentence patterns. です, ます, the core particles は, を, に, で, and numbers. Japanese particles.
By the end of month 1 you should be able to read simple sentences aloud without decoding letter by letter.
Month 2: grammar and verbs
Verb groups and the ます-form. This is the spine of everything that follows, and getting it clear now prevents months of confusion later: Japanese verb groups.
The て-form, which unlocks a large share of N5-N4 grammar: the te-form.
Adjectives, both kinds, and their negatives and past forms.
300 more words, plus the first 60 kanji - taken from within those words rather than as a separate list. Kanji for beginners.
Month 3: exam shape and consolidation
Weeks 9-10: the remaining vocabulary to around 800, and the remaining N5 kanji to about 100. A twelve-week vocabulary plan.
Week 11: a full timed past paper. Then review it properly - the review is where the improvement is.
Week 12: no new material. Error list, listening, one more timed paper early in the week, then rest.
The two things that derail it
Stopping in week five. This is the universal failure point: the novelty has gone and fluency has not arrived. Fix it with structure rather than motivation - a fixed time, a partner, a class, a streak you do not want to break. Staying consistent.
Neglecting listening. N5 listening is slow and clear, and candidates still fail it because they never practised. It is scored separately with its own minimum: sectional minimums. Fifteen minutes daily is enough at this level.
Is N5 worth sitting at all?
Honest answer: for employment, rarely. Employers do not recruit on N5 and the SSW route requires N4 or JFT-Basic. See JLPT levels explained.
Its value is as a deadline and a milestone, and those are real - a booked exam produces study that a vague intention does not.
If your actual goal is working in Japan, consider aiming the same three months at JFT-Basic instead: it runs monthly rather than twice a year and it satisfies the visa requirement outright. Sit the free exam demo to see the format.