Yes, like everything these days you should know your stuff. Others dont care as much as you do as you are the one responsible. Like the Edu visa school messed up some days = asking me to pay the 5 day fine, blackmarked in my passport and never payed me back as usual here, "no hab money today" that was years ago, still no hab money. Chalong school near the sea...
So yes, the Extention is easy, even though they try to trip you up, I wont metion the topic here as I am sure they read it and adapt. Yeah, 5 copies of everything, carry with you..