var sets = [
         {"sets": [0], "label": "A-LEVEL: 338", "size": 338},
         {"sets": [1], "label": "AP: 336", "size": 336},
         {"sets": [2], "label": "IB: 152", "size": 152},
         {"sets": [0, 1], "size": 90},
         {"sets": [0, 2], "size": 34},
         {"sets": [1, 2], "size": 37},
         {"sets": [0, 1, 2], "size": 12}]