Here is a three month study plan that worked for me. It probably could be compressed down to two months if you are really desperate.
In general, I think going through the theory is great but practicing problems and going through the code in advance was what I believe put me over the top.
First Month: Started off taking the NCEES Practice Exam. Scored poorly (< 60%), worked through all the solutions to questions I missed. Went through Graffeo theory cover to cover, it was my main reference book.
Second Month: Hit practice exams hard at my own pace: Complex Imaginary Exams 1, 2, 3, and 4. Scored in high 60%s - high 80%s (improvement noted along the way). Went back and worked through problems I missed.
Final Month: Took two timed tests: Graffeo and NCEES Practice Exam again (most of it wasn't fresh in my mind). Scored in the low 80%s on both. Went back and worked through what I missed. Went through 100 or so code drill problems which I found to be helpful and get me somewhat familiar with the code. Went through all problems that I missed again in all sample tests. Wrote down tons of formulas that were not in Graffeo into the Graffeo book for my reference, along with the ANSI device #'s. The night before the exam I got a hotel room next to the exam location, a nice dinner, and chilled out.
Notes:
-Start your application early! In PA I found the application process and getting approved to be at least as difficult as preparing for the exam. Expect to spend a lot of time on your amplified record of experience and pulling in your references. I probably put in a legitimate 60 hours compiling everything and navigating through the state's channels.
-The 2011 NCEES practice exam has about 7 different problems than the current one so no need to buy the most recent if you have the old version.
-Make sure you have a copy of the NEC during your studying and a copy of the NESC & NFPA-70E for the exam.
-The plan above isn't perfect. I'd say a good 25% of the questions I answered just from having 10 years experience in the power field.
-I recommend uglys pocket electrical reference for the test. It helped me pull an answer out I wasn't prepared for.
Hope this helps.