I took CK in June 2015, matched in March 2016 into radiology. I took 4.5 years off between MS2 and 3 years to do a PhD. Due to my offset schedule, I had a total of 3-4 months of dedicated study time (no rotations + SUPER light electives + vacation) to study on/off over a period of 8 months. I really really really needed this time bc I had to relearn everything after my time off. Plus, I'm horrible at tests - didn't honor a single shelf.
I only used UWorld: took notes throughout my MS3 rotations (used these for shelves), organized my notes, and referenced UpToDate for clarification. I used a few charts in Secrets - definitely had 2 questions from the high/low PT/PTT/INR chart.
Step 1 (a long, long time ago...): 216
USWA: 230 (after 1 month of dedicated study)
NBME 4: 211 (after 1.5 months of dedicated study)
NBME 6: 229 (day before exam)
UWorld: 60% first pass, 67% after going through wrong answers
Actual Step 2 CK: 243
It's no 270 but I was absolutely elated after worrying about my Step 1 score being so far from the average Step 1 score of matched radiology applicants for 6 years. I was finally in the 25th-50th percentile bracket for average Step 2 scores for those who matched into radiology in 2014 (NRMP match outcomes).
Collectively, I don't have a great explanation for my scores. Based on this thread, it seems that NBME 4 is hard, while USWA and NBME 6 get more predictive with higher scores. Perhaps I finally figured out how to study during MS3 year and my practice scores reflect that progression. I guess I was fortunate to be rewarded for my dedication to radiology (PhD was in imaging stuff), perseverance to improve, and eccentricity. At best, I'm kind of a weirdo. I told the place I matched into radiology that I visited in the past and I'm excited to be interviewed bc I've been fantasizing about training there in radiology. My words just came out like diarrhea due to my adrenaline and sheer disbelief they wanted to interview me. Please choose better words than mine and pack UWorld into your skulls by going over things a billion times! Sadly, I've learned there's no secret to learning medicine for mortals (i.e. not AOA) and success is based on repetition with a decent understanding of the material. So keep at it!