Previous Level exams were being broken by the part divider changes, fixed it.

src/components/Solutions/FillBlanks.tsx

@@ -17,6 +17,7 @@ export default function FillBlanksSolutions({
 	onBack,
 }: FillBlanksExercise & CommonProps) {
 	const storeUserSolutions = useExamStore((state) => state.userSolutions);
+	const {questionIndex, setQuestionIndex, partIndex, exam} = useExamStore((state) => state);
 
 	const correctUserSolutions = storeUserSolutions.find(
 		(solution) => solution.exercise === id
@@ -201,7 +202,14 @@ export default function FillBlanksSolutions({
 					color="purple"
 					variant="outline"
 					onClick={() => onBack({ exercise: id, solutions: correctUserSolutions!, score: calculateScore(), type })}
-					className="max-w-[200px] w-full">
+					className="max-w-[200px] w-full"
+					disabled={
+						exam &&
+						typeof partIndex !== "undefined" &&
+						exam.module === "level" &&
+						questionIndex === 0 &&
+						partIndex === 0
+					}>
 					Back
 				</Button>