The easiest way, IMO, is to go to my.scouting.org, then go to:
Menu → My Training → Requirements (tab)
Based on your registered position(s), you will see a Trained patch if you are “trained”. If you don’t see the Trained patch, then you will see the names of the courses that you need to take in order to become trained for your registered position(s).
Also, if SCO_800 expires (after 2 years), it needs to be retaken (required for direct contact leaders). Same with YPT, but for all leaders.
