Hi ydmuley,
For CR I took help from egmat video lesson, it helped a lot to clear out the fundamentals, as to how to identify the assumptions, inferences etc. Then I did extensive practice especially on Veritas prep, each explanation also helps to build the understanding how to identify the wrong answers. RC was one of the strongest points for me, since I am an avid reader since childhood, so lengthy passages were also okay for me, the trickier questions are mostly reasoning based, so CR techniques can be used here.
About the test day...it is impossible not to panic , but if you actually take the practice tests every day (2 sections verbal & quants at one go) as per the timelines, your mind would be totally accustomed to handle the questions on the test day within the timelimit. Also please identify the order of the sections for the test day carefully (i had tried & tested all the combos during my mocks). Try to be little early at the test center to make yourself comfortable & also ensure to take the stipulated breaks in between (it helps to free up the mind). Most importantly don't spend much time studying a day before the exam.
Relax & everything will be great!!! All the best