First off calm down my friend. Everything will be alright. Even if you fail (just per say) there are always other jobs out there. To be honest I don't know that much about the swab test. I don't mean to upset you, but it is possible you might fail it. Don't let this discourage you though. I've been down that road. Money can get tight, but just keep faith. When I'm extremely nervous I pray. Try it. Anyways I wish you the best of luck my friend.