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<p>It is two grade levels ahead of the normal math sequence in US high schools. The normal math sequence in US high schools has students taking trigonometry and precalculus in 12th grade.</p>
<p>Students applying to highly selective colleges or intending to go into math-heavy majors are more likely to be a grade level advanced, taking trigonometry and precalculus in 11th grade and calculus in 12th grade. Being more advanced than that is less common; such students are usually the top students in math at the high school.</p>
<p>Note that very few colleges require students to have had calculus in high school before entering college.</p>