Algebra 1 covers expressions, systems of equations, functions, real numbers, inequalities, exponents, polynomials, radical and rational expressions. The material is text and video lectures, but no practice is available on the site.
Math Planet is an online resource where one can study math for free. Take our high school math courses in Pre-algebra, Algebra 1, Algebra 2 and Geometry. We have also prepared practice tests for the SAT and ACT.