The topics included in the educators' contextual questionnaire covered e.g. biographical information, qualification, teaching experience, professional development, number of classes and periods, percentage time spent on activities during and after school, tests/exams and homework, learner's educational background, attitude of learners towards learning, negative factors on Mathematics teaching, involvement of parents, class profile - size of classes and type of facilities, Mathematics syllabus, improved assessment practices, effective use of learning support materials, and curriculum monitoring. The data file consists of 306 variables and 149 cases.