diff --git a/services/quizzes/src/grading/assessment/choose-n.ts b/services/quizzes/src/grading/assessment/choose-n.ts
index 2671ee17b928..7a6031d900b9 100644
--- a/services/quizzes/src/grading/assessment/choose-n.ts
+++ b/services/quizzes/src/grading/assessment/choose-n.ts
@@ -8,13 +8,20 @@ const assessChooseN = (
   if (!quizItemAnswer.selectedOptionIds) {
     throw new Error("No options selected")
   }
-
+  const totalCorrectOptions = quizItem.options.filter((item) => item.correct).length
+  let correctOptions = 0
+  quizItemAnswer.selectedOptionIds.forEach((selectedOption) => {
+    const option = quizItem.options.filter((item) => item.id === selectedOption)[0]
+    if (option && option.correct) {
+      correctOptions++
+    }
+  })
   const correct = quizItemAnswer.selectedOptionIds.length == quizItem.n
 
   return {
     quizItemId: quizItem.id,
     correct,
-    correctnessCoefficient: correct ? 1 : 0,
+    correctnessCoefficient: correctOptions / totalCorrectOptions,
   }
 }