The research investigated how stress impacts employees' performance and also x-ray whether there is any relationship between stress and performance. To achieve this, the study looked at the meaning of stress generally, various causes of stress, and occupational stress, particularly among the staff of the West Africa Examination Council Kaduna Zonal Office. Data were collected from both primary and secondary sources. The primary source of data was questionnaire administered to the respondents. The secondary data was sourced from textbooks, reports of past works, journals, and materials from the internet. Lazarus' interactional theory was adopted to analyse the work. From the collected and analysed data, the study revealed that there is a significant relationship between the primary sources of stress for employees at the West African Examination Council Zonal Office in Kaduna and their work efficiency and effectiveness and workplace stress have a significant impact on the overall job performance of employees at the West African Examination Council Zonal Office in Kaduna. The study recommended that WAEC should develop and offer specific programs addressing identified stressors, such as high workload and role ambiguity, to help employees manage their stress more effectively also WAEC should improve job descriptions and provide regular feedback to ensure employees have clear expectations and adequate support, reducing role ambiguity and its impact on efficiency.