If you start 10 days prior to the exam with the routine, taking one day between to take a full practice exam, you will have enough problems in the two supplemental guides to sustain that regiment for the entire period. I have actually done all problem solving, data sufficiency, and sentence correction questions in the OG probably three times each at different periods. I'm not sure how you are preparing right now but focusing on building the general broad content proficiency and working on your weak areas... then once you're comfortable, you should be able to recognize most of the traps and tricks in the questions you see. When I took the actual exam, based on all the practice I had been doing over the prior two weeks, no question was really that shocking to me. On the quant section, it was just like cruise control in your car, all the questions were different but all the topics and approaches were the same. On verbal, well, had I not finished the verbal section with 17 minutes left (got anxious and just wanted to finish) I think I would of scored a bit higher than the 38 I received. However, much like quant, you'll recognize the pattern.