<p>Generally, the subjects covered in a Precalculus (or College Algebra + Trig) are advanced Algebra and Eucledian (plane) Trigonometry. Complex fractions, logarithms, conics, matrices, systems of equations, trigonometric ratios, and the unit circle are among the main concepts covered.</p>
<p>If your school placed you on Calc I and you are currently performing excellently in your Trig class there is no need to take Precalculus (because you are technically taking Precalculus now). Simply make sure your Algebra skills are sharpened and learn your Sines and Cosines. On many occasions, students who fail a Calculus class do so due to poor algebra skills.</p>