ENCOA-107, ENCOA-115 Fixed completion percentage, brought back the line numbers, 'Level Exam' was replaced by 'Placement Test', Next/Back instructions with quotes, 'Submit' on last level question

src/components/Exercises/MultipleChoice.tsx

@@ -76,6 +76,7 @@ export default function MultipleChoice({ id, prompt, type, questions, userSoluti
 
 	const {
 		questionIndex,
+		exerciseIndex,
 		exam,
 		shuffles,
 		hasExamEnded,
@@ -143,7 +144,7 @@ export default function MultipleChoice({ id, prompt, type, questions, userSoluti
 			}
 			return isSolutionCorrect || false;
 		}).length;
-		const missing = total - correct;
+		const missing = total - answers!.filter((x) => questions.find((y) => x.question.toString() === y.id.toString())).length;
 		return { total, correct, missing };
 	};
 
@@ -193,7 +194,12 @@ export default function MultipleChoice({ id, prompt, type, questions, userSoluti
 				</Button>
 
 				<Button color="purple" onClick={next} className="max-w-[200px] self-end w-full">
-					Next
+					{
+						exam && exam.module === "level" && 
+						partIndex === exam.parts.length - 1 && 
+						exerciseIndex === exam.parts[partIndex].exercises.length - 1 &&
+						questionIndex === questions.length - 1 
+						? "Submit" : "Next"}
 				</Button>
 			</div>
 		</>