Yep I have played in 8 of em. Now I cannot as I am USA player.
Basically, you complete a 7 question exam. There are sessions for each FTPA Sit-N-Learn if you feel like watching an actual training video before taking the FTPA Sit-N-Learn exam. You can get 1 question correct and 6 wrong and still win the ticket to the $5000 freeroll the following month. The tourney usually does not appear in the lobby until the Thursday before the Saturday that the tournament is held. I believe there are 24 Sit-N-Learns. So if you just be sure to only finish 1 Sit-N-Learn per month, you can be in 24 $5000 freerolls.