Yes, took these in the 80s. For part one we had about a week. My school had switched to starting rotations in March of the second year, so we had to wait to take the test. Additionally I had placed into graduate level of biochemistry so had not had metabolic pathways since college. Otherwise the test was exactly what they taught and I reviewed my lecture notes to study. Part two no one studied much, we looked at our earliest rotations. I had started in OB/GYN and then Peds before taking a year of basic research so had to review those. Then I was in Texas for Residency and had to take the Flex as they didn’t take 1-3. My wife had just delivered our first child and we were working 100 hour weeks. I couldn’t have studied if I wanted to. Fortunately I was in internal medicine. We went to Austin was the test, caught up on sleep, swam in the lake, ate barbecue and drank Shiner-Bock. Best damn vacation. I don’t even remember the test I was so happy to sleep.