suffix
graded on N steps; scored out of N
Suffix attached to a number N, indicating that something is evaluated on an N-level scale or scored out of N points. Common in educational and testing contexts.
このテストは5段階評価で採点されます。
This test is graded on a 5-step scale.
アンケートは10段階評価でお答えください。
Please answer the questionnaire on a scale of 1 to 10.
Compound of 段階 (stage, level) and 評価 (evaluation). The exact historical derivation is uncertain, but it is a transparent modern compound.