private function save_grade( $attempt ) {

		// phpcs:disable WordPress.Security.NonceVerification.Missing -- Nonce verified in `maybe_run_actions()` method.

		$remarks = isset( $_POST['remarks'] ) ? llms_filter_input_sanitize_string( INPUT_POST, 'remarks', array( FILTER_REQUIRE_ARRAY ) ) : array();
		$points  = isset( $_POST['points'] ) ? llms_filter_input_sanitize_string( INPUT_POST, 'points', array( FILTER_REQUIRE_ARRAY ) ) : array();

		$questions = $attempt->get_questions();
		foreach ( $questions as &$question ) {

			if ( isset( $remarks[ $question['id'] ] ) ) {
				$question['remarks'] = wp_kses_post( nl2br( stripslashes( $remarks[ $question['id'] ] ) ) );
			}

			if ( isset( $points[ $question['id'] ] ) ) {
				$earned             = absint( $points[ $question['id'] ] );
				$question['earned'] = $earned;
				if ( ( $earned / $question['points'] ) >= 0.5 ) {
					$question['correct'] = 'yes';
				} else {
					$question['correct'] = 'no';
				}
			}
		}

		// Update the attempt with new questions.
		$attempt->set_questions( $questions, true );

		// Attempt to calculate the grade.
		$attempt->calculate_grade()->save();

		// If all questions were graded the grade will have been calculated and we can trigger completion actions.
		if ( in_array( $attempt->get( 'status' ), array( 'fail', 'pass' ), true ) ) {
			$attempt->do_completion_actions();
		}

		do_action( 'llms_quiz_graded', $attempt->get_student()->get_id(), $attempt->get( 'quiz_id' ), $attempt );

		// phpcs:enable

	}