College as the base line assumption for getting a job is really bad, but there are a lot of other good effects that a year of college can give you that high school can't.

1) Since it's a lot bigger you will tend to mix with a much larger (and more diverse) number of people in an adult setting.

2) Since you get to choose your own subjects you can experience gaining knowledge that you actually want to gain, rather than knowledge as a means to an end (this would be even more true if again college wasn't a base requirement for jobs).

3) Most people will need to move at least a little way to go to college, which can help stop them forming a rut that they settle into after school and never get out of again.