Is taking the hardest classes possible in high school that important when applying?

Colleges & Universities A-Z University of Pennsylvania
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<p>Penn’s CDS stated that rigor of secondary school record is very important, page 10.
<a href=“http://www.upenn.edu/ir/Common%20Data%20Set/UPenn%20Common%20Data%20Set%202010-11.pdf[/url]”>http://www.upenn.edu/ir/Common%20Data%20Set/UPenn%20Common%20Data%20Set%202010-11.pdf&lt;/a&gt;
And Wharton applicants should have strong math background, take AP Calculus if you get a chance, see link below
<a href=“http://talk.collegeconfidential.com/university-pennsylvania/256526-what-wharton-wants.html[/url]”>http://talk.collegeconfidential.com/university-pennsylvania/256526-what-wharton-wants.html&lt;/a&gt;&lt;/p&gt;