In average SAT, Colby 2000, St. Michaels 1700. In admissions %, Colby 18%, St. Michaels 78%. Schools will often offer financial aid to those who will be among their best students.
The differences in job and graduate school rates between the schools are probably related partly by the differences in the student levels going in. Also, Colby students probably tend to be from wealthier backgrounds. So, there is a logical fallacy in implying you will have better career chances based on the statistics. However, there is a huge difference between those schools.