I understand you’re a bit lost, so I’ll give you a couple of hints to solve each puzzle and get all the endings. Spoiler Alert:
Main Endings:
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To get the 4 main endings: Basically, the difference lies in whether you resisted temptation on the previous days, and whether you resisted it on the last night. The variations come from which ones you resisted and which you didn’t. The first three days count as one, so if you fail one, the rest also count as failed.
Puzzles:
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To solve the 1st puzzle: each girl described in the note from the gym corresponds to a girl in the story. Remembering on which day each one appears, you need to order them according to the note.
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To solve the 2nd puzzle: on the second day you’ll find a book that tells you in what order you should read the books. Keep in mind that the available books change each day.
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To solve the 3rd puzzle: you were right to go to the sink. There, if you lower only the music volume (not the sound), you’ll be able to better hear a sequence that you’ll also need to input in the lockers.
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To solve the 4th puzzle: as the book indicates, you must follow a specific route in the classroom.
I hope this helps, and that it doesn’t ruin the experience for you!