Khan Academy on a Stick
Trigonometry and precalculus
Videos and exercises on trigonometry. Watch the "Geometry" playlist first if you have trouble understanding the topics covered here.

Graphing lines
(38 videos)
Thinking about graphing on a coordinate plane, slope and other analytic geometry.

Functions and their graphs
(36 videos)
Revisiting what a function is and how we can define and visualize one.

Polynomial and rational functions
(63 videos)
Exploring quadratics and higher degree polynomials. Also indepth look at rational functions.

Exponential and logarithmic functions
(17 videos)
An look at exponential and logarithmic functions including many of their properties and graphs.
 Basic Trigonometry (38 videos)
 Trig identities and examples (24 videos)

Parametric equations and polar coordinates
(7 videos)
An alternative to Cartesian coordinates.

Conic sections
(22 videos)
A detailed look at shapes that are prevalent in science: conic sections

Systems of equations and inequalities
(23 videos)
What happens when we have many variables but also many constraints.

Sequences and induction
(26 videos)
An assortment of concepts in math that help us deal with sequences and proofs.

Probability and combinatorics
(38 videos)
Basics of probability and combinatorics

Imaginary and complex numbers
(20 videos)
Understanding i and the complex plane

Hyperbolic trig functions
(2 videos)
Motivation and understanding of hyperbolic trig functions.

Limits
(7 videos)
Preview of the calculus topic of limits