A mechanism is provided in a data processing system for determining comprehensiveness of a question paper given a syllabus of topics. Allowing slight saturation of an image thereby, effectively reduce the power consumption in the backlight. A worksurface support and a seat support are mounted to and extend upwardly from the base, and the worksurface and seat are mounted to the worksurface and seat supports, respectively, so as to be adjustable in elevation.