It depends upon exactly where you stand between 50-60. If you are averaging around 50, than I would say that you are cutting it real close and would have to outperform your usual when it comes time to take the test. In my experience, I would not rely on that because that usually adds extra pressure. However, some people tend to rise to the occasion and outperform.
I think the STEP 3 minimum passing score is 184. I am not sure what that correlates to but here are some recent Step 3 scores that I have heard of, including mine.
99/249 (510 NBME)
97/241
88/215
86/210
84/206 (430 on NBME)
83/203
80/197
77/191
77/190
75/184
If I had the USMLE WORLD correlates to the above I would probably be of more help.....sorry
All I can tell you is that, for me the 26 rule worked. That is take your average score after doing the entire USMLE WORLD ( without repeats!!!) and add 26, that will be your two-digit score.
Good luck