*** I've been thinking about the "Modelers license". This hobby is full of compromise for various reasons beyond all our control... so I think you keep it / pass with honours just by thinking about it and then trying your best.
Here is an example where a skilled modeler was issued with an infringement notice. (Said modeller knows right from wrong - he has more books than all the libraries I've seen put together and more knowledge on the railways of Britain than I will ever accumulate)
Decided to handlay track in a short section of his layout under rework.
Makes the comment in concersation about it while looking at my "ribblehead" layout trackwork... "When I re-lay the track I should make the panels x feet long with sleepers closer at each rail joint"
Bear in mind he knows, has the ability, owns a ruler and is already handlaying each sleeper that he has cut accurately to length
But - when I visit... Layouts done... BUT.... He didn't do it.
This is a really minor thing I'd not have noticed if he hadn't made an issue of it in the first place... but he was a man of huge awareness and had both ability and opportunity.... and importantly... also often advised others of things they should be doing "properly

)
HE got at least a fine and a couple of demerit points off his modelers license because he failed to do as well as his knowlege and ability allowed him to do "As well as he was able" . (His real penalty was the "conscious error/self inflicted wound" was highlighted in the club rag - a punishment indeed)
So:
My point: A modelers license is actually hard to lose - all you need to do is THINK about things, and then try to do your best. Its the trying and doing your best within your knowledge, ability and budget that lets you grow as a modeler and lets your modelers license be for life.
Its only those who compromise needlessly that ever fail their modelers license
Richard