Free ?s from USMLE and their correlation to actual score

Each year the USMLE will put out a free set of questions. Historically some people have had repeat questions from NBME 18/17 or the Free 130 released each year located here under sample items: http://www.usmle.org/practice-materials/.  They have had repeat questions from these on Step 1! 

Using these 130 + a paid 4 block exam will help simulate the stamina needed for test day. If you wish to do the 7 block a couple of times let me know. They reuse a fraction of questions each year so we have to go back a couple of years to find a “unique” test. No key to any of this so I recommend meeting up with people to talk about stuff and make sure you get the content down.

A reddit user called SpaceHawkins plotted 30 people's performance and got the following chart. Basically. Free ? percent correct * 2.68 + 11 = USMLE Step 1 score. The r squared is 0.80 which is pretty good.

Block 1: 90%
Block 2: 92.5%
Block 3: 92.5%

Need more questions than just this years batch from USMLE? Be sure to check out Indiana School of Medicine. They have been keeping up with these over the past several years. You can find them on their pages. http://medsci.indiana.edu/c602web/602/c602web/usmle/2007step1.pdf is an example of a link. Want 2008 too? Just change the year and you have more questions straight from the usmle source!