MATH
Khan Academy RIT levels for lessons
RITtoresource.org
LearnZillion.com (video lessons for Math & LA organized by CCSS)
Xtramath (set up a class to give kids daily 3-5 minute practice and monitor progress)
READING
Readworks.org (passages with questions, sort by Lexile level)
Tweentribune.com (nonfiction articles by Lexile level)
Newsela.com (current events, can adjust Lexile level)
Storybird.com
Wordsift
Rewordify
Paperrater.com
