When you back up, turn your head and look behind you. Don’t rely on your mirrors only. Also before you leave, make a show of adjusting your mirrors and seatbelt and stuff like that. Use your blinkers, obviously this is a given. If you’re nervous about parallel parking, practice at home first if you can. Use cones or markers in your driveway if you are able. Not everyone’s test is the same, you might not even do parking. As far as the knowledge test, if you don’t know/remember the answer, pick the one that makes the most sense. They’re all multiple choice