interactmath.org This is a tutorial website for many high school topics. When you get to the website, just click "enter". The new screen will ask you for a textbook. The Pearson 2011 edition is very similar to the one we use. Select it and choose a level to start. It checks your answer for correctness and will walk you through a problem if you wish.
phschool.com/atschool/txtbk_res_math.html This is the website of the textbook manufacturer. Choose the Alg II 2004 edition. You will be able to pick a particular section from any chapter for a tutorial on the major topics from the section.
Geogebra.org This is an interactive graphing program that is rated very high in quality. You can download it for free. It is used anywhere from simple geometry to high level calculus. The tutorial walks you through many examples. I highly recommend this for every high school student.
Purplemath.com This is a web site that has excellent concept development for students to understand an area of mathematics. I use many of their explanations in the Daily Lessons section.
KhanAcademy.com This is a web site contain short instructional videos developed by a MIT professor. It coverts the basic procedures on a very wide range of topics covered in the high school curriculum. This is highly recommended for the student to view before they even cover the material in the class.