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1. Divination Weekly Planner

Hopefully you'll keep it more accurate than most of Professor Trelawney's prophecies.
$40, Ruskerville on Etsy.
With a truly Ravenclaw interior.

Also available in Gryffindor, Hufflepuff, and Slytherin.
2. Hippogriff Quill Ballpoint Pen

Ideal for jotting down history (of magic) notes.
$18, Liselle Made on Etsy.
3. Hogwarts Luggage Bookbag

Just add an undetectable extension charm, and you can carry as many books as Hermione.
$34.95, WB Shop.
4. Harry Potter Textbook Notebooks

Including Advanced Potion Making, The Standard Book of Spells, and Defence Against the Dark Arts, The Essentials
$11.83, My Sweet Paper Card on Etsy.
5. Post-It Note Monster Books

Just stroke the spine, it'll calm right down.
$17, Drowsy Aurora on Etsy.
Scribble in the margins at your own risk.
$34.01, Kiko Illustrador on Etsy.
8. Marauder's Map Mouse Pad

$11.99, Art Press Studio on Etsy.
9. Deathly Hallows Hogwarts Lunch Box

Accio treacle tarts.
$19, Midnight House Elves.
10. Hogwarts Library Bookplates

You'll have a more organized library of texbooks than Madam Pince.
$10 for 15 bookplates, Deeply Dapper.
11. Snape Quote Tote Bag

You read this in Alan Rickman's voice, didn't you?
$12, Alohomora Design.
12. Owl Sticky Notes

13. Spectra Specs

You can also ask to borrow Luna's.
$12.99, Target.
14. Productivity Timing Hourglass

Increase your homework productivity by pretending you're taking an O.W.L. Or slowly losing all your House points.
$60, Uncommon Goods.
15. Wand Pencils

Cast an anti-theft charm on these so they don't get "borrowed."
16. Harry Potter Poetry Magnet Set

It's like fanfiction for your locker.
17. Library Tote Bag

Because, as Ron says, "That's what Hermione does."
$15, Alohomora Design on Etsy.
18. Potions & Parchment Candle

So you can set the scene for studying.... or playing a game of Wizard's Chess.
19. Felix Felicis Bottle Necklace

Obviously a necessary school supply during finals.
$9.99, Salem Knight.
20. Washi Tape

To decorate all your boring Muggle stuff.
$5.98, Collecting Life on Etsy.
21. Wingardium Leviosa Pencil Case

When you want to ~levitate~ your grades.
$13.81, Rakete Berlin on Etsy.