For Parents of Elementary and Preschool Children
http://www.meddybemps.com/7.24.html - Help your child learn to read
http://web2.uvcs.uvic.ca/elc/studyzone/410/reading/pepper.htm -More reading passages with practice tests!
For Middle and High School Students
11 Rules of Writing -This site condenses English grammar down to just eleven rules. Drawing heavily from The Elements of Style, an anonymous college teacher created these rules based on his experience grading freshman papers. Each rule is hyperlinked to examples of correct and incorrect usage. For questions not covered by the eleven rules, peruse the Frequently Asked Questions page. And for extra credit, click on the New Word of the Day (at the bottom of the page) to scroll through some high-school level vocabulary.
Blue Book of Grammar and Punctuation -"Effective Writing. Rule 1. Use concrete rather than vague language." As the title implies, Jane Straus's guide is divided into two sections: grammar and punctuation. Each is further organized into rules with examples (navigate these with the drop-down menus), exercises and tests. The quizzes are not interactive (try printing them instead) and include answer keys on the same page. A print edition of The Blue Book is also available for purchase.
Common Errors In English -From "AM/PM" to "your/you're," this clickable alphabetic list of errors is fun to peruse. Sometimes the easiest way to learn proper grammar, is to learn what NOT to say. For example, did you know a "pompom" is a large gun, but the fuzzy end of ski hat is a "pompon"? And a narrow confining garment is a "straitjacket" not a "straightjacket." Just click on any phrase for the complete skinny.
http://www.quia.com/ -Check out the student zone! Here students can learn about homonyms, contractions, plurals, irregular verbs, etc. All learning is presented in an interactive way.
Grammar Bytes! -Great site for teaching grammar basics with an interactive twist!