Read the following paragraph:

excerpt from "how prepared are students for college level reading? applying a lexile-based approach."

despite recent national- and state-level legislative initiatives focusing on postsecondary success and an increasing emphasis on educational attainment to successfully enter the job market, high rates of enrollment in remedial college courses indicate that many students are graduating from high school unprepared for college-level work (strong american schools 2008; terry 2007).

based on the context clues, what does the word "remedial" mean?

advanced
corrective
high-level
superior