Replying to Parallel Parking tips

Anyone have any good parallel parking tips? My test is coming up and I don't want to fail. I know I can pass everything else but I was never really good at backing up from the start. Up until now i've just been pulling up steering wheel to steering wheel, start turning automatically then once my right rear view mirror hits their bumper I start turning the other way and slide in. This is alright and I get it about 75% of the time but i'm looking for other ways so I can get it perfect on the test. I know there's some good drivers on here so help me out!