This report lists the winners of Subject Certificate of Excellence awards (formerly Certificate of Distinction awards) in 2020, along with the school that they attended.
These awards are granted by the School Curriculum and Standards Authority to the top 0.5% of students in each tertiary entrance subject based on their examination marks.
Special Subject Certificates of Excellence may be awarded to a student who is ineligible for a Subject Certificate of Excellence but who has otherwise satisfied all other requirements for the award.
| 1 | Accounting and Finance | Subject Cert of Excellence | Collins, Siobhan | St Hildas Anglican School for Girls | Mosman Park |
| 2 | Accounting and Finance | Subject Cert of Excellence | Marvelli, Blake | Sacred Heart College | Wangara |
| 3 | Accounting and Finance | Subject Cert of Excellence | Morrison, Cooper | Aquinas College | Salter Point |
| 4 | Accounting and Finance | Subject Cert of Excellence | Psaltis, Natasha | Presbyterian Ladies College | Peppermint Grove |
| 5 | Accounting and Finance | Subject Cert of Excellence | Shah, Vedant | Rossmoyne Senior High School | Rossmoyne |
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| 6 | Accounting and Finance | Subject Cert of Excellence | Tombleson, Alex | Bunbury Cathedral Grammar School | Bunbury |
| 7 | Ancient History | Subject Cert of Excellence | Bromley, Jes | Christ Church Grammar School | Claremont |
| 8 | Ancient History | Subject Cert of Excellence | Hia, Su-Jyn | Perth Modern School | Subiaco |
| 9 | Applied Information Technology | Subject Cert of Excellence | Abdullahi, Abdi-Wadud Awil | Australian Islamic College Kewdale | Kewdale |
| 10 | Applied Information Technology | Subject Cert of Excellence | Pang, Kieron | Leeming Senior High School | Leeming |
| 11 | Biology | Subject Cert of Excellence | Arvino, Lucas | Trinity College | East Perth |
| 12 | Biology | Subject Cert of Excellence | Grewal, Nimmat | St Marys Anglican Girls School | Karrinyup |
| 13 | Biology | Subject Cert of Excellence | Jayaram, Akash | Perth Modern School | Subiaco |
| 14 | Biology | Subject Cert of Excellence | Lim, Christie | Perth Modern School | Subiaco |
| 15 | Biology | Subject Cert of Excellence | Not For Publication | Kennedy Baptist College | Bull Creek |
| 16 | Biology | Subject Cert of Excellence | Pinto, Ilona | Willetton Senior High School | Willetton |
| 17 | Biology | Subject Cert of Excellence | Price, Annie | Presbyterian Ladies College | Peppermint Grove |
| 18 | Biology | Subject Cert of Excellence | Robertson, Alexander | Perth Modern School | Subiaco |
| 19 | Business Management and Enterprise | Special Subject Cert of Excellence | Tay, Kai Wen | Sunway College | Malaysia |
| 20 | Business Management and Enterprise | Subject Cert of Excellence | Chai, Calley Annyi | Sunway College | Malaysia |
| 21 | Business Management and Enterprise | Subject Cert of Excellence | Engelhard, Olivia | St Marys Anglican Girls School | Karrinyup |
| 22 | Business Management and Enterprise | Subject Cert of Excellence | Lally, Luke | Wesley College | South Perth |
| 23 | Career and Enterprise | Subject Cert of Excellence | Scafetta, Sofia | Santa Maria College | Melville |
| 24 | Career and Enterprise | Subject Cert of Excellence | Wijesuriya, Budmi | Rossmoyne Senior High School | Rossmoyne |
| 25 | Chemistry | Special Subject Cert of Excellence | Cho, Sangwook | Perth Modern School | Subiaco |