The Personal Statement of Experience (PSE) essay is strongly recommended for students applying to a Queen’s first-year program. The PSE and Supplementary Essay are mandatory for all Commerce students.
https://www.queensu.ca/admission/about-applying/pse
Choose one extracurricular activity or one employment opportunity you have listed on your Personal Statement of Experience. In 300 words, or fewer, describe the impact of this experience and the greatest learning outcome for you. You answer will be evaluated for content and writing style.

https://www.queensu.ca/admission/sites/default/files/assets/Commerce%20SE%202019.pdf
These are sample questions that should be used only for practicing writing your Supplementary Essay. The actual questions on our submission system will not be the same as the sample questions. All applicants to the Commerce program must complete both the Personal Statement of Experience and the Supplementary Essay.

Sample Supplementary Essay Question
1. What unique perspective or life experiences would make you a valuable member of the Queen’s Commerce Class of 2023?
Please answer in 300 words, or fewer. 
2. What is the most important lesson you learned from a mistake you have made? Please answer in 300 words, or fewer.