How do college credits work?

Calculus tends to be more standardized in content, and more easily checked in an exam format.

While this may be true at those engineering programs with the most competitive admissions, most engineering programs assume only that the student is ready for calculus (i.e. has completed precalculus in high school).

If the course that you can skip with AP credit is an important prerequisite for other courses, it would be a good idea to try the college’s old final exams for the course to check how well you know the material by the college’s standards.