ISI runs its own two-stage selection for MSQE: the objective PEA paper this platform's practice papers cover is followed by a descriptive PEB paper and, for some cycles, an interview, for candidates shortlisted from PEA. ISI does not publish a single "cutoff mark" the way GATE or JAM do -- shortlisting for PEB is based on that cycle's PEA performance and the number of seats, and final admission also weighs PEB and the interview. Check ISI's official MSQE admission notice for the current cycle's shortlisting and admission process.