I just played a game where everything went right and the National Will was sky-high. Rule 11.2 suggests the National Will can exceed 5. I just want to double-check this, since it feels odd there's no way to track it. So I just write it down on a piece of paper or something if it goes higher?
During the game, National Will cannot go higher than the 5+ box (rule 10.0).
Rule 11.2 ("add the final value of the Turkish National Will (see 10.0; note that this can exceed +5; use the actual value)") is only for scoring after the game is over. So there's no need to worry about how to "track" it. It's just a one-time calculation of your score after the game is over.