向无限忠于毛主席革命路线的好干部门合同志学习; 终生不忘阶级苦; 无限热爱毛主席
Shanghai geming jiaoyu chubanshe (上海革命教育出版社)
From (incomplete) series on the martyr Men He, here shown teaching Tibetans to love Chairman Mao.
The text on the blackboard: "Chairman Mao, long long live!" (毛主席万万岁!).
The text in a frame, left in the background, is a "Quotation from Chairman Mao" (毛主席語錄).