Attend school on time-I think that we attend on time will not make us miss the content teacher. We can relate the content from start to finish and that's important to attend school on time is also provided for teachers too.
Study on time - I think we class on time will make us not to miss the content อาจารย์สอน. We can relate content from beginning to end. And most importantly, the class on time also in respect to the teacher.