HMC does offer various levels of entry math courses:
https://www.hmc.edu/mathematics/program/mathematics-course-descriptions/
https://www.hmc.edu/mathematics/program/placement-core-classes/
- 30G = standard HMC calculus, which is proof based and expects the student to have had calculus before (70% of students)
- 30B = HMC calculus course for students who do well enough on a placement exam; includes "deeper study of selected topics" (25% of students)
- exempt from 30G/30B by placement test (5% of students)
This is not too different conceptually compared to other colleges in terms of offering different levels of entry math courses. The main difference is that the lowest level entry math course at HMC is like a high honors calculus course at many other colleges (if such a course is even offered at many other colleges).