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

src/components/Solutions/TrueFalse.tsx

@@ -4,10 +4,13 @@ import reactStringReplace from "react-string-replace";
 import {CommonProps} from ".";
 import {Fragment} from "react";
 import Button from "../Low/Button";
+import useExamStore from "@/stores/examStore";
 
 type Solution = "true" | "false" | "not_given";
 
 export default function TrueFalseSolution({prompt, type, id, questions, userSolutions, onNext, onBack}: TrueFalseExercise & CommonProps) {
+	const {questionIndex, setQuestionIndex, partIndex, exam} = useExamStore((state) => state);
+	
 	const calculateScore = () => {
 		const total = questions.length || 0;
 		const correct = userSolutions.filter(
@@ -121,7 +124,14 @@ export default function TrueFalseSolution({prompt, type, id, questions, userSolu
 					color="purple"
 					variant="outline"
 					onClick={() => onBack({exercise: id, solutions: userSolutions, 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>