My 1st Grade Kids Are 100 Days Smarter Gift Tshirt. Happy 100th Day of School Shirt. fun gift for 1st Grade teachers to celebrate 100 days of school. Perfect for celebrating 100 days of school! Happy 100th Day of 1st Grade gift great for Primary or Grade School Teacher, Principals. Gift for Pre-k, Preschool, Kindergarten, Middle School, Elementary School, First 1st Grade, 2nd Grade, 3rd Grade, 4th Grade, 5th Grade, 6th Grade, 7th Grade. Lightweight, Classic fit, Double-needle sleeve and bottom hem