There are some mistakes in your posting in regards to boards exams. As you said, Podiatry students take the NBPME (National Board of Podiatric Medical Examiners) Part 1 boards at the end of the second year and NBPME Part 2 at the end of the fourth year. Majority of the graduates will sit for the NBPME Part 3 (PMLexis). Whether you need to take the PMLexis and when you need to take the PMLexis will depend on the state that you wish to practice in. For example, Pennsylvania requires all new incoming residents to take the PMLexis before starting the residency program. On the other hand, New Jersey does not recognize PMLexis exam and does not require the practicing Podiatrists or residents to take the PMLexis.
After completing your 2 or 3 years of residency training, you will be eligible to sit in various board certification exams based on your residency training. If you completed the 2 years of residency training (PM&S-24), you will be eligible to sit for the ABPS (American Board of Podiatric Surgery) Foot Surgery Board Exam and the ABPOPPM (American Board of Podiatric Orthopedics and Primary Podiatric Medicine) Board Exam. If you completed the 3 years of residency training (PM&S-36), you will be eligible to sit for both ABPS Foot Surgery Board Exam and ABPS Reconstructive Rearfoot Surgery Board Exam and the ABPOPPM Board Exams.
In your posting you had mentioned ACFAS (American College of Foot and Ankle Surgeons) and ACFAOM (American College of Foot and Ankle Orthopedics and Medicine). These are societies that a resident or practicing Podiatrist may join. They are not responsible for board certification exams. In order for someone to attain fellow status in one of these two societies, one would need to be fully board certified in the respective exams (ABPS for ACFAS and ABPOPPM for ACFAOM). For someone to be fully board certified, one would need to pass both the written exam (most people usually take this after graduating from the residency program) and the oral exam (usually taken after attaining certain amount of cases while practicing). I hope that this would clarify some of the information in your posting and answer the question of the original poster of this thread (clovers).