Richard the Third and In the Lake of the Woods are your texts for 'Reading and Responding'; the section where you write a direct essay on your text and need to know them back to front. Given that, definitely start on these on the holidays, read through each once and try and take an early preference in one or the other. If you're still undecided, it doesn't matter too much but of course it helps to prioritise your studies early. Once you've decided, try and read through the one you want a second time and highlight all the important quotes. Either text is good IMO, but Richard might be a turn off if Shakespearean language pisses you off. However, I'd say the ability to mention stagecraft puts you at an easy advantage over others since not many others bother to mention this stuff. On the other hand, from what I've heard, In the Lake of the Woods had a pretty ugly topic this year that no one was prepared for, so I think that goes to show that this text leaves a lot of room for topics you've never seen. Besides, McRob is doing this text too so you MIGHT want to stay away =P (but of course, this shouldn't affect your decision if you want to do this text)
The Crucible and The Secret River are your texts for the Encountering Conflict context, so you won't need to know these very in-depth, but it helps to have general understanding of the plot so a skim read might do it. I'd say its hard to start using these until you start doing the context and know exactly what you're looking for in these texts, since they're really just a source of examples. So I'd say hold back on these, and focus on your other two.