Mass education refers to a state-run educational system, usually *free and compulsory*, that claims for propaganda reasons, to ensure that all children in society have *at least a basic level of usefull knowledge and ability*. In reality, the designers of public education systems generally see the institution's function to be the indoctronation of youth as to make them more subservient to the dominent political or economic hierarchy.

تغيرات التعليم في بريطانيا تعكس التوجه نحو التعليم الإلزامي

Please note the parts in the web definition which are set between stars above. Both reflect the term تعليم إلزامي as we call it in Arabic countries. It's also called sometimes تعليم أساسي, but as in some arabic countries أساسي reflects the elementary stage *المرحلة الابتدائية*, then I'd go for إلزامي.