First of all file an appeal on RTI to first appellant authority,First Appeal is the statutory remedy available to the RTI Applicant, when there is no response from the Public Information Officer within stipulated time limit or the decision of PIO is not satisfactory or the PIO offered / supplied incorrect / misleading information or demanded exorbitant further fee etc. The First Appeal is required to be filed under Section-19(1) of RTI Act.
Further if appeal is also dismissed than second appeal can be made before the Central Information Commission .
After this only way could be file a writ petition before high court to direct department to release interview marks, total marks and cut off.
You can also directly go before high court through writ without challenging the rti but a 1% risk that high court will ask that you challenged RTI or not than there can be issue.
otherwise in case of apparent scam high court shall appreciate your petition and can pass favourable order.