Do you want to use the Internet to improve your English?
Below is a short list of good resources.
California Distance Learning Project - www.cdlponline.org/
Lots of easy reading stories with vocabulary and grammar
ESL Partyland http://www.eslpartyland.com/
This has topics with questions, quizzes, vocabulary
This site lets you listen, write, and compare your writing to a correct version.
Guide to Grammar and Writing http://grammar.ccc.commnet.edu/grammar/
Easy to use. Lots to learn
For academic English, Essay writing, grammar, research information