So I “frequently” get the harder ones before the “easier ones”.
But that can be a problem at times (and it was today) because some of the words fit fully into more than one category.
If you get them in order of easiness, then the 5 words that would fit into a harder category are narrowed down to just 4.
But if you figure out a harder connection first you may put the wrong word into it because you didn't eliminate it with the green group yet. 

That's what happened to me today and messed up a perfect game.