Writing(also called English) and Reading:

http://www.sparknotes.com/testprep/books/act/chapter4.rhtml

Use this for English(Writing) in chapter 4,5,6, and for Reading in Chapters12 and 13. If you want to go directly to a different chapter, change the chapter number in the address above. You can also click on a forward and backward arrow on each chapter web page to access other chapters. Each chapter has several sections to work through.

http://www.edufind.com/english/grammar/

There is a free test(results through e-mail). The best part, however, is an extensive grammar tutorial(menu#2).

Pre-Algebra(Basic Math) and Algebra-High School Level

http://www.khanacademy.org/ Select the math tab and get clear instructional videos on basic math, pre-algebra and algebra 1. Especially helpful if you struggle with math concepts.

http://coolmath.com For ages 13-100! This is a colorful and fun site with excellent teaching units. Select "Pre-Algebra" and "Algebra."

http://www.math.com Select "Pre-Algebra" and "Algebra" from the upper left-hand corner.

STAY AWAY FROM THE PARTS THAT REQUIRE PAYMENT FOR SERVICES!!

http://www.purplemath.com/modules/index.htm This includes an extensive list of algebra helps.

Free Practice Tests and Sample Questions

http://www.act.org/compass/sample/ Although there is a book that can be purchased, there is also a FREE section. In the left-hand column, click on "Compass Test Preparation." Then scroll down until you see the list of self-assessment modules. These are FREE. Try to do all of them, The answer key is at the end of each practice test.

http://www.4tests.com/ Select free practice tests for ACT for Reading and Writing only. The math getrs too advanced quickly. You can also choose the GED for practice tests on Reading, Writing, and Math. Again AVOID the sections that want to charge you for materials.