General Resources -

Soft School - a website with worksheets from a variety of topics

Khan Academy - A great site for lessons and tutorials in all subjects, but especially helpful for Math and Science

Grammar Resources -

Grammar Gorillas - a game to help identify the parts of speech

Grammar Blast - more games on parts of speech and sentence structure

Vocabulary.com - a great place to increase your vocabulary

Math Resources

IXL Math - Practice your math skills here! A variety of skills at a variety of levels.