The Short Answer
Your APS (Admission Point Score) is calculated by converting your final matric percentage in each subject into points. This is done using a scale where each grade band earns a set number of points. Your best six subjects are then added together (excluding Life Orientation in most cases). A 70-79% in a subject typically earns 6 points while an 80-100% earns 7, and so on down the scale. Add your best six and that total is your APS. Requirements vary by institution and course, so the same APS can qualify you in one place and fall short in another. If you're not sure which courses suit your strengths, regardless of what your APS allows, the free YUNI Aptitude Test and Personality Assessment are a useful place to start.