Created a score calculator

src/utils/score.ts

@@ -0,0 +1,61 @@
+type Type = "academic" | "general";
+
+const readingGeneralMarking: {[key: number]: number} = {
+	100: 9,
+	97.5: 8.5,
+	92.5: 8,
+	90: 7.5,
+	85: 7,
+	80: 6.5,
+	75: 6,
+	67.5: 5.5,
+	57.5: 5,
+	45.5: 4.5,
+	37.5: 4,
+	30: 3.5,
+	22.5: 3,
+	15: 2.5,
+};
+
+const academicMarking: {[key: number]: number} = {
+	97.5: 9,
+	92.5: 8.5,
+	87.5: 8,
+	80: 7.5,
+	75: 7,
+	65: 6.5,
+	57.5: 6,
+	45: 5.5,
+	40: 5,
+	32.5: 4.5,
+	25: 4,
+	20: 3.5,
+	15: 3,
+	10: 2.5,
+};
+
+const moduleMarkings: {[key in "reading" | "listening"]: {[key in Type]: {[key: number]: number}}} = {
+	reading: {
+		academic: academicMarking,
+		general: readingGeneralMarking,
+	},
+	listening: {
+		academic: academicMarking,
+		general: academicMarking,
+	},
+};
+
+export const calculateBandScore = (correct: number, total: number, module: "reading" | "listening", type: Type) => {
+	const marking = moduleMarkings[module][type];
+	const percentage = (correct * 100) / total;
+
+	for (const value of Object.keys(marking)
+		.map((x) => parseFloat(x))
+		.sort((a, b) => b - a)) {
+		if (percentage >= value) {
+			return marking[value];
+		}
+	}
+
+	return 0;
+};