績 means achievement, result and is a JLPT N2 kanji. It has 17 strokes and uses the thread radical (糸).
Stroke order · 17 strokes
On'yomi (音読み)
セキ
Kun'yomi (訓読み)
—
Radical
糸 · thread
Strokes
17
How to remember 績
The result of a duty (責) fulfilled thread (糸) by thread — accomplishment. 成績 (results) — the day you get your 成績表 (report card), hearts race the same in every country.