If you want the deepest, clearest path through 'Arcana Academy', I personally recommend starting with the publication order and sprinkling in side stories as recommended by the author—it's the safest way to preserve reveals and character growth. Begin with the prologue or Volume 0 if there is one, then read the mainline volumes in order (1, 2, 3...). The early volumes establish rules of magic, the academy's social layers, and who the primary rivalries and friendships are. Skipping around can ruin a few of the quieter reveals that later pay off emotionally.
After you've got through the first major arc (usually volumes 1–5), take a break to read any officially labeled side stories, short story collections, or interludes that focus on secondary characters. Those are often written later but answer questions about motivations and give small, satisfying detours without spoiling the big plot twists. Then return to the main sequence for the mid-arc escalation and the tournament/war arc—these are usually where plot threads start snapping together.
Finally, reserve epilogues, author notes, and later companion volumes until after the finale. If there are alternative timelines or a “what if” spin-off, treat them as optional dessert: fun but not required. If you like, maintain a checklist (prologue → main volumes in publication order → side stories after the first big arc → finish mainline → epilogue/companion works). That approach kept me emotionally invested and prevented me from accidentally spoiling the subtle reveals. I still grin remembering the slow-burn reveals in the middle volumes.