totally depends on how much time u can put in per week and what your backgound is. I didn't pass this time around, but based on my scores it looks like i was really close. I had virtually no educational background in business, but studied really hard. I started studying Sept 1st for the december exam. I put in about 15 -20 hrs per week, until the last 2 weeks at which point i cranked it to about 25 -30 hrs a week. I would have passed had my time mgt been better in the morning session and if i focused more on the qualitative stuff and less on memorizing long financial models. Most of the exam seemed to be about relationships.
I recommend getting some study notes though and use the books as a backup on difficult issues.