classes:  lecturer. lecturers often take a lot of breaks, teaching methods are not attractive that students can not focus on studying.  curriculum. lecturers often take a lot of breaks, teaching methods are not attractive that students can not focus on studying.  facility. lecturers often take a lot of breaks, teaching methods are not attractive that students can not focus on studying.  general. lecturers often take a lot of breaks, teaching methods are not attractive that students can not focus on studying.