You can re-test at any of the test dates the following year/season. Keep in mind that there is a, $50 admin fee and $15 charge, for each station to be re-tested. You will also be sent your score card for the practical stations which should indicate the area of concern. From here you go back over the manual (you may want to purchase one if you did not in the first place), test book and ask your co-workers/employer/supervisor for pointers and help!