Ключевые слова: back to scool, blackboard, blonde, caucasian, chalk, chalkboard, class, classroom, education, exam, exercise, female, focus on foreground, formula, girl, green, indoors, knowledge, learning, lesson, mathematics, mock up, mockup, pupil, school, schoolgirl, schooling, science, selective focus, september, smart, space, standing, student, subject, task, tutor, write, writing,