remember to avoid doing the fulltests of 22, 23, 30, 36, as these will be your TM diagnostics.
hmm, i'd concentrate on learning the methodology of the LRB thoroughly. it's not easy to master, unless you study it, memorize it and practice it. that's what the bible preaches.
do one thing at a time... or else you'll burn yourself out. with RC, here's what i'd practice:
a. identify absence/presence of author's tone. if you sense author's tone, then focus on that to find main point. if main point is absent, then worry more about the facts.
b. know the purpose of each paragraph. draw a mental road map of where the passage is goin.
c. be familiar with different RC passage structure types, including chronological, general to specific, specific to general, etc.
d. dont get too bogged down on the details... but again, know where everything is.
e. practice, practice and practice. read nova's RC to be familiar with the question types, but that's all they're going to help you with. in terms of knowing the diff structures and being able to detect the tone, etc, you'll need exposure to RC passages. start practicing if you have time. i hear TM doesn't really focus on RC.