Mensa for Kids Book Lists
Grades K-3
https://www.mensaforkids.org/achieve/excellence-in-reading/excellence-in-reading-k-3-list/
Grades 4-6
https://www.mensaforkids.org/achieve/excellence-in-reading/excellence-in-reading-4-6-list/
Grades 7-8
https://www.mensaforkids.org/achieve/excellence-in-reading/excellence-in-reading-7-8-list/
Grades 9-12
https://www.mensaforkids.org/achieve/excellence-in-reading/excellence-in-reading-9-12-list/