One of the best ways to prepare yourself for judging JO competition is to visit the Education Page of the NGJA website.
This resource provides videos and routines analysis for JO, NCAA and FIG levels. You can do this by yourself, work in a group or consult with other judges or coaches. Have fun and see how you compare to NGJA experts!!!
Below are help sheets that include the most common Junior FIG skills and seen at Junior levels: