Skills that are covered by the test are:
 Elementary operations with numerical and algebraic functions
 Operations with exponents and radicals
 Linear equations and inequalities
 Polynomials and polynomial equations
 Functions
 Trigonometry
 Logarithmic and exponential functions
 Mathematical modeling  word problems.
Online Practice Test: http://defunct.mdtp.ucsd.edu/
Recommended algebra / trigonometry refresher books:

JustInTime Algebra and Trigonometry for Students of Calculus, 2nd Edition by Mueller & Brent. AddisonWesley ISBN: 0321269438