Here are some websites that I think you would find very helpful.

Textbooks:

Social Studies:    Houghton Mifflin Social Studies Textbook-Ancient Civilizations-Student site Parent site

Religion: Sadlier Oxford Publications -We Believe-Student  Parent

Math: Sadlier Oxford Publications Progress in Math Gr. 6

Worldly Wise: wordlywise3000.com

Reading: Classzone.com

Science:  Science Voyages

Study Skills:

Study Guides and Strategies

Study Skills-Virginia Tech

How-to Study

Resources:

CTN (Catholic Television Network) (Great Site for Religion and other Curriculum Areas)

Schwab Learning Center (Great Site for Learning Differences/Disabilities)