K12 Reader

All grade levels

Printable worksheets include early reading, writing, and spelling skill activities for elementary grades, and carry through intermediate and more advanced grammar, comprehension and writing activities for older students. 

https://www.k12reader.com/grade-level/grades-k-12/

Khan Academy

Parent dashboard for all subjects: Reading for grades 2-5

https://www.khanacademy.org/parent