| 33 × | biology | 5 × | elements | 2 × | javascript | ||
| 20 × | chemistry | 4 × | accounting | 2 × | mnemonic | ||
| 14 × | spelling | 4 × | java | 1 × | reports | ||
| 13 × | english | 4 × | geography | 1 × | accountants | ||
| 12 × | medicine | 3 × | genetics | 1 × | financial | ||
| 11 × | periodic-table | 2 × | humanbody | 1 × | immunology | ||
| 10 × | anatomy | 2 × | classification | 1 × | ecology | ||
| 7 × | programming | 2 × | interviews | 1 × | dates | ||
| 6 × | botany | 2 × | physics | 1 × | taxonomy | ||
| 6 × | mathematics | 2 × | symbols | 1 × | music |