This investigation examines the performance of secondary school students on WAEC and NECO SSCEs from 2004 to 2006. The researchers, having reason to doubt the parallel nature of the examinations conducted by WAEC and NECO, undertook a quantitative analysis of the performances of candidates in the SSCE in select subjects – Mathematics, English Language, Chemistry, Physics, Biology, Literature-in-English, Economics, Government, Agricultural Science, Food and Nutrition, and Geography, so as to establish their comparability. The research design was correlational. A sample of 1,233 participants was drawn from a population of 1,422,140 examination candidates using a purposive sampling technique. The instruments for data collection included the WAEC and NECO SSCE Result Forms. Eleven hypotheses were tested with the Pearson correlation technique set at 0.05 alpha level. Findings indicate a statistically significant positive relationship between candidates’ performance on WAEC and NECO SSCEs in all the subjects.