How many of them will go through all four years and complete the degree? Based on experience from my undergrad, quite a few switch majors after 1st or 2nd year,

How many of them will go through all four years and complete the degree? Based on experience from my undergrad, quite a few switch majors after 1st or 2nd year, and most of those who stick with it purposefully choose the absolute minimum CS/math that's required by the major, so that alone should give you an idea about the quality of most grads.