I did not mean the weed out classes, rather it was just the first two years.

Some people cannot handle the freedom and will not buckle down. Others never had to work hard and just stop pushing. Others get into personal dramas. Or drugs. Or never wanted to be there. Or work too much. Or have the wrong friends. Or thought professors were your friends. A few cannot do the work and they don't seek help.

Day by day, distraction by distraction, they make the decision to do something other than focus.

The Tier 1 schools have a ferocious pace. You really have to do 2-5 hours a night of homework to do well. It has to be your focus. Once you commit to working that hard, the rest follows.

The nerdy thing - "The limit of the major goes to Business as the GPA goes to zero."