<p>Precalculus is a fancy name for trig. In high school, it's typically advanced algebra the first semester (e.g. conics) and actual trigonometry the second semester (e.g. sin/cos/tan, identities).</p>
<p>Calculus in high school is generally single-variable. AP Cal AB covers through definite and indefinite integrals. AP Cal BC would include improper integrals, sequences, and series.</p>
<p>The standard no-deviation track would have students take trig in eleventh grade and calculus in twelfth grade.</p>
<p>If you skip maths, you could even end up taking calculus in ninth grade, like I did ;)</p>