Here are some websites you might find helpful.  Also, be sure to check out brainfuse HelpNow for live tutoring and other useful study aides!

General:

FACT MONSTER - http://www.factmonster.com/

HOMEWORK SPOT - http://www.homeworkspot.com/

English:

DISCOVERY EDUCATION - http://www.discoveryeducation.com/

Math:               

ABC YA – http://www.abcya.com/

COOL MATH - http://www.coolmath.com/

FUN BRAIN - http://www.funbrain.com/

Reading:

ABC YA – http://www.abcya.com/

FUN BRAIN - http://www.funbrain.com/

INTO THE BOOK - https://reading.ecb.org/

STAR FALL - http://www.starfall.com/

Science:

HOWARD HUGHES MEDICAL INSTITUTE - https://www.hhmi.org/

NATIONAL GEOGRAPHIC KIDS - http://kids.nationalgeographic.com/