～点
～てん · ～ten · JLPT N2 · noun
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💯🎯 点 means dot or point, and ten sounds like a perfect ten on a score
The kanji 点 originally meant a small dot or mark, so it came to mean a point. A score is a tally of points, so 100点 (hyaku-ten) means 100 points, as in a perfect test score.
点 — fire radical 灬 + 占 (zhān, phonetic)
Originally written 點, a semantic-phonetic compound: 黑 (black) gave the meaning 'small black mark or dot' while 占 supplied the sound. It first referred to ink spots, then extended to 'point, drop, a little,' and verbs like 'to mark' or 'to light (a fire),' reflected in the simplified form's 灬 (fire) component.