How to approach UWorld and a formula to calculate Step 1 score

UWorld is without question the best resource for practice questions. Your goal should be to get through Uworld twice. This includes a first pass, incorrects, a reset, a second pass, incorrects. My first pass percentage was 72% which is in the 84th percentile. Do not let the percentiles encourage you. Everyone is on a different playing field when this is calculated. Some people are on their second pass which will artificially deflate the percentiles.

Here's a chart that will help you correlate you uworld first pass percentile to your possible exam score. Notice mine correlates and several others did as well. 

https://usmle-score-correlation.blogspot.com/