A study was undertaken at California's College of the Canyons to determine outcomes for students who challenged course prerequisites and enrolled in courses requiring placement levels higher than recommended between spring 1993 and fall 1994. Data were gathered from analyses of 529 placement/prerequisite waiver forms and transcripts from 445 students who had challenged a mathematics or English prerequisite. The sample included 203 students who had challenged math prerequisites and 242 who had challenged English prerequisites. Among the mathematics students, 154 actually attempted the mathematics course and 39.6% received a passing grade of C or higher. Among the students challenging English prerequisites, 162 attempted the English course and 48.8% received a grade of C or higher. The results indicate that since mathematics courses are more sequential in nature, students are less likely to succeed without the suggested prerequisites. Future research is recommended to compare the success rates of students attempting a course with and without the recommended prerequisites. (AJL)