How early must one focus on engineering in college?

<p>There is a program in my state that if completed (consists of basically 50 hours of volunteering), we can earn 2 years of community college tuition for free. However since CC is not my route, I found out that we can take two classes in the summer and it also get it free.</p>

<p>That way I can have a calculus class taken before I into physics / engineering since I will have only completed Pre-Calculus by graduation.</p>