Test are frequently longer and harder. Even the best students can be caught off guard. I remember vividly FaceTiming with our son (a practice @colorado_mom thankfully suggested we do that we still maintain today) after his first test. It was in honors calc 3. He said something happened to him that had never happened before…he got a C on a math test. It wasn’t curved and he scored a 79. I asked him what the range was. He said there were scores in the 30s. Every student in the class had scored a 5 on the Calc BC AP test. He ended up with an A, but it was a good intro into what would be needed going forward.