Knowledge, Guts, Kindness, Charm and Proficiency aren't a checklist — they're locks on specific Confidants, and every afternoon you spend on one is an afternoon you didn't spend on a hangout.
The five social stats — Knowledge, Guts, Kindness, Charm, Proficiency — aren't self-improvement for its own sake: each one is a lock that specific Confidants, jobs and dialogue options refuse to open until you've raised it. The scarce resource behind all of it isn't money, it's afternoons, and every hour spent raising a stat is an hour not spent with the person that stat was supposed to unlock.
Knowledge, Guts, Kindness, Charm and Proficiency each rank from 1 to 5, and the rank is checked against a threshold, not against your overall progress. Get the number, and the door opens the same day — there's no waiting period on top of it.
The doors are Confidants, mostly. Our exam and stat table already lays out what Knowledge buys you around the school calendar; the same logic runs through the rest of the cast. Munehisa Iwai, the Hanged Man, won't let you rank up his Confidant past a certain point without Guts 4 — you can meet him earlier, but the relationship stalls exactly there until you clear the bar. Several other Confidants — Ann, Yusuke, Futaba, Haru, Hifumi, Takemi, Kawakami, Sojiro among them — have equivalent gates on their own arcs, at ranks the sources don't agree closely enough on to print here. The pattern is what matters: a Confidant you can't advance is an afternoon wasted, because you show up, get told to come back later, and the day is gone anyway.
Proficiency and Charm double as job requirements on top of Confidant gates — some part-time work won't hire you under a stat floor, so a job you're saving for later can quietly depend on a stat you haven't been raising.
The naïve way to plan an afternoon is «what raises Knowledge fastest». The better question is «what raises Knowledge and does something else», because in a calendar this tight, a stat gain with no second benefit is a worse use of the same hour than one with two.
Three patterns repeat across every stat:
The activities that raise a stat and nothing else — reading a specific novel, watching one film, tending the plant in your room — aren't bad, but they're the ones to slot into a spare moment rather than build a whole evening around, because they don't pay you back twice the way the three above do.
Answering a question correctly in class raises Knowledge, and it costs no time slot at all — it happens inside a school day you were already spending. That makes it the one Knowledge source with no opportunity cost, which is why it's worth getting right every single time rather than shrugging when you're unsure.
Exams multiply that logic: doing well raises Charm on top of Knowledge, and finishing first nets you an item from Sojiro. The full method for both — which answer to pick, and what rank of Knowledge each exam needs before "correct" is even enough — is in the class and exam answers guide; there's no reason to work it out from scratch when the table already exists.
The same activity isn't worth the same every day. Rainy days push studying and crafting higher than usual, and the bathhouse and certain hangouts are more efficient on specific days of the week — sources differ on exactly which days, which is itself the useful takeaway: check the calendar's weather icon before deciding what to do with an afternoon, rather than defaulting to the same activity out of habit. A Knowledge grind on a sunny day is a smaller return than the same grind after rain.
The mistake that costs the most is planning one afternoon at a time. Look instead at which Confidants are coming up against a stat wall in the next month, and route your spare afternoons toward whichever stat unblocks the most people at once — Knowledge and Charm tend to gate the widest set of things early, simply because exams touch both. If you're chasing every Confidant in one run, a stat check you clear in June is one less thing competing for your November, when there are no spare afternoons left to fix it.
The one afternoon that's never wasted is one spent with a Confidant who's currently available: it advances the relationship whether or not a stat gate is involved, and a stat gate you hit later is a problem for a day when you have less to lose.