Each one is detailed here:
http://blog.gocollege.com/2007/11/23/reasons-why-college-dropouts-exist/?1. Homesickness and feeling that you don’t fit in
2. Educational burnout
3. Academic unpreparedness
4. Personal or family issues
5. Financial constraints
6. Too much fun — but not enough education
7. The school isn’t a good academic fit for the student
8. Setting sights on the wrong major
9. No guidance or mentors
10. External demands
11. Time to move out