Concentration on core classes has not prepared students for college

A study sponsored by those who publish the ACT says students need more than just the core classes in order to be able to succeed at the college level.
According to an article in today's Washington Post:

Using research on the college success of students who took the ACT college entrance test, and comparing their test scores to their high school records, ACT researchers found that many core courses were not carefully constructed or monitored and that students often received good grades in the core courses even if they didn't learn much.

The study also suggests that students need to take upper-level classes in the core subjects.