Information is presented about the grade 12 diploma examinations for Mathematics 30, Biology 30, Chemistry 30, and Physics 30 that were administered in 1986. Topics explained include: (1) general format of the examinations (stating the content, emphasis, and time allotments); (2) examination schedules (listing the calendar dates and times for the examinations); (3) preparation of the examinations (describing the review process); (4) scoring of the examinations (specifying the required qualifications of the markers); and (5) descriptions of the Mathematics, Biology, Chemistry, and Physics examinations (explaining the content, blueprint, and distribution of questions by percentage for each examination). Appendices include guidelines for significant digits, manipulation of data, rounding, and an explanation of cognitive levels. (RH)