I’ve known teachers who would not allow a student to take a test until all the homework was done. This can be a nightmare, because some students will simply choose not to take the test either! (Then they get their invitation to the homework party.) This one works best when nothing else seems to work with the habitual homework avoiders who really do need the practice to be successful. It also works better when you provide additional help to the student so they can complete the work, since it’s very likely that they’re not doing it because they’re discouraged.