To be honest, it really depends on what your strengths and weaknesses in each category are and your commitment to the test. First off, the NCLEX, is not a joke. Cramming may work for some, but if you're someone who really needs to warp their head around the information before taking a test, make sure you leave a good 3 to 4 weeks to study.
The review course is also a great idea and they should give an answer about how long it will take you to review before you are ready for the exam. According to the ATI plan I did, it took me 4 weeks before I was ready for my second chance. I ultimately delayed it till a later date because my test anxiety was in overdrive.
Also, look into a few other books to help you with your studying. These were very helpful for me and trust me, in the long run, you'll be glad you spent the money and time for a career that is high in demand and growing every year.
Here are the books.
Good luck and hope that was a little bit helpful.