Castle-tiles are scored from left to right.
I think this is wrong. You are free to resolve your castle tiles in whatever order.
I remember this because I explained that to every player that was new to the game. And then all players did not remember the rule until they wanted to turn squires they just attained to a new knight or a knight upgrade. And then they checked back the rule that they are allowed to resolve their tiles as they please.
We were even making fun of that rule at times, because everybody asked that question sooner or later and I had to clarify for each player again