function dozent_get_quizzes_by_course( $course = null, $args = [] ) {
		global $wpdb;

		$default_per_page = dozent_show_per_page();
		$current_page     = (int) dozent_input_text( 'current_page' );
		$page             = max( 1, $current_page );
		$start            = ( $page - 1 ) * $default_per_page;

		$defaults = apply_filters( 'dozent_get_quizzes_by_course_default_args', [
			'not_in_ids' => [],
			'start'      => $start,
			'per_page'   => $default_per_page,
		] );

		$r = wp_parse_args( $args, $defaults );
		extract( $r, EXTR_SKIP );

		$course = get_post( $course );

		if ( empty( $course->ID ) ) {
			return new DozentDBResponse();
		}

		$not_in_ids_query = '';
		if ( ! empty( $not_in_ids ) && dozent_count( $not_in_ids ) ) {
			$not_in_ids_string = implode( ",", $not_in_ids );
			$not_in_ids_query  = " AND quizzes.ID NOT IN( $not_in_ids_string ) ";
		}

		/**
		 * Filter the default quizzes status for Count course including {post_status}
		 *
		 * @since DozentLMS 1.0.0
		 *
		 * @param  array []  $array
		 */

		$course_status = apply_filters( 'dozent_get_quizzes_status', [ 'publish' ] );

		$in_sql       = "";
		$where_in_sql = dozent_array_to_in_sql( $course_status );
		if ( $where_in_sql ) {
			$in_sql = " AND quizzes.post_status IN($where_in_sql) ";
		}

		$limit_query = '';
		if ( $per_page !== '-1' ) {
			$limit_query = " LIMIT {$start}, {$per_page}  ";
		}

		$from_sql = "FROM {$wpdb->posts} course
		INNER JOIN {$wpdb->posts} course_sections ON course.ID = course_sections.post_parent
		INNER JOIN {$wpdb->posts} quizzes ON course_sections.ID = quizzes.post_parent AND quizzes.post_type = 'dozent_quiz'";

		$quizzes_count = (int) $wpdb->get_var( "SELECT COUNT(quizzes.ID) {$from_sql} WHERE 1 = 1 AND course.ID = {$course->ID} {$in_sql} {$not_in_ids_query} ;" );

		$quizzes_results = $wpdb->get_results( "SELECT quizzes.* {$from_sql}
		WHERE 1 = 1 AND course.ID = {$course->ID} {$in_sql} {$not_in_ids_query} {$limit_query} ;" );

		$response          = new DozentDBResponse();
		$response->count   = $quizzes_count;
		$response->results = $quizzes_results;

		/**
		 * Filter the return of dozent_get_courses_by_instructor() function
		 *
		 * @since Dozent LMS v.1.0.0
		 *
		 * @param  DozentDBResponse  $response  Query Results with
		 * @param  WP_Post  $course  Course Object
		 */

		return apply_filters( 'dozent_get_quizzes_by_course', $response, $course );
	}