@dcplanner My son also mentioned to me that there were options offered for students to “catch up” if need be, but he didn’t use these. My S had taken calculus 1 at a nearby college because his high school didn’t offer it. On his first exam in calc 2 the professor wrote on his exam “drop down to calc 1.” My husband and I advised our son to drop down as the prof suggested. He refused, used Kahn academy, and ended up with a B. As you mentioned, changing classes or tweaking a major are also options for kids who may not have a strong enough background in math or science.