My eldest son prepares to go to college now. And the colleges know that. Joseph has received so much mail from institutions of higher learning that, ton for tonnage, it could stall a mule. I've studied these advertisements. I've analyzed what most schools consider their best hook to catch a student. And I've discovered here a hierarchy of courses: At the top is what students seem to want from education; at the bottom is what they must take to get what they want. What's at the top is vocational: jobs.