<p>Some colleges do have different levels of introductory courses. For example, in math, at Harvard, there are 6 different levels or flavors of Multivariable Calculus and Linear Algebra (19, 20, 21, 23, 25, 55). The first 3 can be said to be aimed at different types of majors, the last 3 are different levels of difficulty.
There are also 2 levels of intro physics, one for those who got a 5 on BC-Calc and one who got a lesser score (there are also courses that are really more in line with “Physics for Poets” that do not require Calc).</p>