Agreed, 7 days is not a lot of time. The human brain can really only learn about 2 hours worth of material at a time before neurons are overloaded. If you're planning on doing 8-hr cramming sessions each day, you won't retain most of what you learned. For every 2 hours of work, you should take at least 1-2 hrs break.

Instead, start by taking a practice test (if you haven't already done so). Identify 7 topics that were weak for you, that you could reinforce in 2-3 hours apiece. (So, not CR as a whole, but assumption questions within CR). Focus on improving just a few weak areas, because if you try to improve everything, you'll spread yourself too thin.

Good luck!