classes:  lecturer. The subject should have more forms of exercises so that students remember longer and understand more forms of mathematics so that when meeting the exercises, the tests do not have to fear its form.  curriculum. The subject should have more forms of exercises so that students remember longer and understand more forms of mathematics so that when meeting the exercises, the tests do not have to fear its form.  facility. The subject should have more forms of exercises so that students remember longer and understand more forms of mathematics so that when meeting the exercises, the tests do not have to fear its form.  general. The subject should have more forms of exercises so that students remember longer and understand more forms of mathematics so that when meeting the exercises, the tests do not have to fear its form.