It is your responsibility to find out what assignments you have missed. It is not the teacher's responsibility to remind you of missed assignments. You must not be absent on a test day. If you are seriously ill, call and let the teacher know you will not be there for the test. If your teacher allows make-up tests, you should take the test within one or two days after returning to class.
Serious illness is the only reason for missing a test.
It is considered rude to be late. Also, it bothers other students. If you must come in late, be sure to do it quietly. Have your books and papers out of your bag before you come into the room. Then go to your seat and sit quietly.