That same worry persisted for me right up until the exam. Remember to breathe every now-and-again--you still have about three months of productive study left.Also, after a long day at work, I am barely putting 2 hours each night and extra hours on the weekends. I am worried that I am not studying enough for this April's tests. What were your study routines like for those of you who passed?
I studied about 10 hours a week on average, but was able to drag it out over 9 months. That's just what my schedule permitted from a work and personal standpoint. The rule-of-thumb that others have suggested in the past is that "adequate" study will amount to about 300 hours for the 16-hour exam. Your results may vary, of course.
Agreed with Titleistguy that at this point, working problems and making annotations along the way is a sound approach. Practice exams are helpful to identify areas of weakness, as well as to get comfortable with the constructed response problems. You can then go back to the codes to brush-up the weak areas. I think I took one practice exam about 6 weeks out as a diagnostic, which allowed time for brushing-up on problems I missed. I took a second practice exam 2 weeks out, to catch any last-minute points that remained.
Best of luck to you, and keep breathing!