i do trotsky too, but i doubt you will get asked a historiography question again like they did when they asked a couple of years back "balanced interpretation of personality etc". there was a big outrage by students and staff about that question because it disadvantaged those who didn't do ext. history, only a minority, becase they were able to ease through the question.
IF they happen to by any chance ask that, for trotsky you might want to explain how socialist historians such as deutscher gave a different history of trotsky, because he was very pro-trotsky for example.
Good luck tomorrow