I'll be doing AIC and OMAM (on my birthday, might I add!) and to be honest I'm bricking it. The mystery surrounding what it could be about really gets to me! I know I'll most likely be okay but I'm just quite worried about what it could be about. I think, from reading this thread, I'll be placing my bets on the Candy/dog and Carlson shooting scene or the Lennie/Curley fight for part (a). Then following on from that in part (b) i guess it would be about the instilled prejudiced views of the time and survival of the fittest (linking to Candy's dog and Carlson) or for the other prediction of the Lennie/Curley fight, it could be to do with reputation and masculinity on the ranch. I think these are quite difficult, so they could come up.
For AIC, I'm less worried because of the two options you get, however in every mock I have done, I have only picked the themes question. I am just unsure of how to write so much about one character. We have been taught to make three paragraphs on the question and then a paragraph on settings, symbols and theorists, as well as an intro and conclusion. So I just find there is more to write about for the theme question.