Every car's OBDII diagnostic is going to be slightly different (between manufacturers, anyway), but you should not be dismayed. You have five days until you fail your test, which is more than enough time to ensure your vehicle will be OBDII ready. This of course, does not mean if there is an underlying problem it won't cause you to fail for a different reason (like a bad cat or something). With that said, ensure you are driving your vehicle every day until you can take it back for the retest. When you drive it, ensure you run the vehicle up to operating temperature and then drive it for several miles (10-20 miles) to ensure the system is doing it's self checks. If you give it several days, it will reset. If you want to have it checked before you take it to the station, you can take it to an AutoZone, Advance Auto, or the like. If you do take it to a place like that to have them check the status, ENSURE THEY DO NOT RESET THE SYSTEM!! If they do, you'll be back to square one.
It just takes a little time and a few system cycles. The key here is to run the car to fully warm, drive for a while, then allow it to fully cool before you go on your next drive. You can do several of these in a day and get to a "good" state sooner.