琢 means (name) polished and refined and is a JLPT N1 kanji. It has 11 strokes and uses the king / jewel radical (王).
Stroke order · 11 strokes
On'yomi (音読み)
タク
Kun'yomi (訓読み)
みが(く)
Radical
王 · king / jewel
Strokes
11
How to remember 琢
A gem (王) polished bright through grinding. 切磋琢磨 means improving together through mutual polishing — the classroom ideal! In names: 琢磨, 琢也 (brother of 拓哉).