Hello! Today I have to study for tomorrow’s test, and I have an assignment that I need to finish, but I have a part-time job late at night. So, I think I’ll only get a little sleep tonight. That’s terrible news for me, because I haven’t been feeling well lately. Since "Today I have to story for tomorrow's test," "I have an assignment that I need to finish," and "I have a part-time job late at night" can all be complete sentences by themselves, you should add commas after each phrase. "Too bad news" sounds awkward. "Terrible" can mean "very bad," so I edited that in.