校 means school and is a JLPT N5 kanji. It has 10 strokes and uses the tree radical (木).
Stroke order · 10 strokes
On'yomi (音読み)
コウ、キョウ
Kun'yomi (訓読み)
—
Radical
木 · tree
Strokes
10
How to remember 校
People coming and going (交 = mingling) in a wooden (木) building — an old-fashioned wooden schoolhouse. 学校 (school), 高校 (high school). Tree + mingling = school, not bad at all.