KanjiJLPT N2
Graduate

graduate, soldier, private, die

Mnemonic

A hat is thrown skyward by one person, caught by another person mid-air, as they both cross the stage together — it's finally time to graduate! The crowd roars as the hat tumbles back down and each person crosses into their new life.
Additional thoughts
Visualize the kanji structure: hat on top, two people side by side in the middle, cross at the bottom. Classic graduation cap toss scene — two friends finishing together, crossing the threshold into the future.
Quick recall
Two persons toss a hat, cross the stage, and graduate.

Details

The keyword for 卒 is graduate. This kanji refers to the completion of a course of study or training, signifying the moment when one finishes and moves on. It also carries the broader meaning of "to end" or "to conclude," and historically referred to low-ranking soldiers or servants. The sense of finishing or bringing something to its conclusion ties all these meanings together.
On'yomi
そつ、しゅつ
Kun'yomi
そっ.する、お.える、お.わる、ついに、にわか