diff --git a/lib/TestResult.js b/lib/TestResult.js
index bada376..a801789 100644
--- a/lib/TestResult.js
+++ b/lib/TestResult.js
@@ -113,6 +113,17 @@ class TestResult {
 		return 'C';
 	}
 
+	delete() {
+		const sql = `
+			delete from
+				testResult
+			where
+				testResultId = ?;
+		`;
+
+		this.#conn.runQuery(sql, [ this.id ]);
+	}
+
 	static async create(conn, testId, accountId, studentId, mark) {
 		const sql = `
 			insert into testResult