Salam docs, this post is regarding USMLE Step 2 CS: It is very very important to know the centre you register in. The best centre according to many reviews is Houston. Atlanta and Chicago come second. AVOID Philadelphia and LA (because in these centres you compete with Harvard and Yale students so their standards are high). Many of the IMGs who go to Philly and LA fail. Remember: CS has a limited number of seats. So register early (at least 4 months ahead)!