The study analyzed the psychometric properties of Mathematics Objective test items in Basic Education certificate examination from 2018 to 2020 academic sessions in Rivers State. Three research questions guided the study; Evaluation and descriptive survey designs were employed for the study. In determining the psychometric properties of the test items, a sample of 1500 JSS3 marked students’ scripts were randomly drawn from six Local Governments Areas using the multistage sample approach of purposive and proportionate techniques, out of the population of 19056 JSS3 marked students’ scripts in the 105 public secondary schools in the six Local Government Areas in Rivers State. Past mathematics objective test items question papers and JSS1 to JSS3 curriculum and syllabus were used as the instrument for data collection, R. Software was used to calculate the reliability, difficulty indices, discrimination indices and distracter indices, while percentage, frequency and scheme of work were used to ascertain the content validity. The findings indicated that the objective test items content area were not in adequate proportion, the co-efficient of internal consistency was high, Basic Education Certificate Examination 2018 had the highest reliability coefficient. All the test items passed the psychometric properties criteria. It was recommended among others, options that options that distracted those in the high ability needs to be reviewed for effectiveness in attracting the low ability students, for example item 60 was a bad distracter as it had a negative value. This would improve students’ academic performance in Mathematics in Basic Education Certificate Examination in Rivers State.