I hear from advisors that it's better to take less rigorous classes in the summer because the course tends to go quite fast. I'm planning on taking Pre-Calculus in the summer so I can take Calculus in the regular school year next year. What are the risks? Any feedback or advice from those who've already taken Pre-Calculus... particularly in the summer? I have a friend that took Pre-Calculus in the summer but got a D in it. He passed the Calculus entrance exam though and went straight to Calculus his next year, despite his failing grade.