Group of elementary school children in classroom at lesson

elementary student elementary school ukraine elementary age 4-5 years classroom education child student teacher 8-9 years 6-7 years young adult learning preparation mathematics teenager 4k university test results childhood small school children board eraser happiness caucasian picking up hand boys children only teenage boys success mathematical symbol indoors human hand writing back human back group people body part lifestyles friendship close-up chalk - art equipment green schoolgirl blackboard - visual aid waist up girls togetherness chalk drawing looking up plank - timber human eye