Start with high-confidence school & education books, then narrow by subgenre or adjacent topics.
A Writer's Notebook
Ralph Fletcher
Janice Vancleave's Chemistry for Every Kid
Janice VanCleave
Summer Brain Quest: Between Grades K & 1
Workman Publishing, Megan Butler
Maybe Yes, Maybe No
Dan Barker
Big First Grade
School Zone
Manners at School
Carrie Finn
Manners in the Library
Brain Quest Workbook: Kindergarten Revised Edition
Workman Publishing, Lisa Trumbauer