<p>
</p>
<p>However, students and parents should be aware that having to retake courses can delay graduation. This is especially true if they are part of a sequence of prerequisites, so having to retake the course delays the rest of the sequence (especially if the course is only offered once per year, instead of every semester or quarter), so that having AP credit may not make up the slack. Even if the AP credit makes up the slack, having to repeat the course displaces schedule space that could have been used for another free elective course.</p>