My D is a MechE and she went right into calc 3 with no regrets. Calc 2 at her school was known as notoriously difficult, so she didn’t want to torture herself needlessly. She did fine in Calc 3 as well as LinAlg and DiffEq, and was glad to have a little breathing room in her schedule. She was also furious that she didn’t place out of intro Chem (only scored a 4 and her college requires a 5) because she found the class a repeat of what she learned in HS, and the curve was tough. My S is following in her footsteps, and she has recommended to him to skip Calc 2 and Chem, as well as Physics 1 and 2 if he can score a 5 on both Physics C exams. Both of my kids went/go to a tough independent HS that teaches beyond what is required for AP exams, so things may vary depending on what the student’s HS preparation is like.