Abstract
This study assessed the 2021 and 2022 item difficulty parameters of Senior Secondary School Geography Mock Examinations in Federal Capital Territory, Abuja. The study adopted Expost facto research design. The populations of the study consist of 2,456 students in 2020 / 2021 and 2,828 students in 2021 / 2022 academic session. Multistage sampling procedures that includes stratified, proportionate and
simple random samplings were used to select a sample of 1,576 and 1,552. FCT was stratified along the existing six Area Councils. Two research questions guided the study. The instruments for data collection in this study were the 2021 and 2022 Senior Secondary School three Geography Mock Examination questions papers. Item Response Theory analysis of responses of students was used to answer research questions one and two. Item difficulty parameters were analyzed with 4.22 X-calibre version window software. Result of the analysis show that the instruments have low difficulty indices. The implication of this is that Mock examinations cannot be widely
used to predict final examinations and admit candidates into tertiary institutions. It was recommended that training and retraining of staff to build the capacity of teachers with relevant skills in test construction.