Open the project with visual studio

Go to /Views/StudentExam/TakeExam.cshtml

Scroll down until you see the “function startTimer”, change it to the code below.

function startTimer(duration) {
    var timerid = "totalSecondsLeft" + "@Model.StudentId" + "@Model.ExamId";
    let durationInSecond = duration * 60;
    if (localStorage.getItem(timerid) == null) {
        localStorage.setItem(timerid, durationInSecond);
    }
    let totalSecondsLeft = localStorage.getItem(timerid) || durationInSecond;
    interval = setInterval(() => {
        let totalSecondsLeft = localStorage.getItem(timerid);
        totalSecondsLeft--;
        localStorage.setItem(timerid, totalSecondsLeft);
        const hours = Math.floor(totalSecondsLeft / 3600);
        const minutes = Math.floor((totalSecondsLeft % 3600) / 60);
        const seconds = totalSecondsLeft % 60;
        let timer = document.getElementById("timer");
        timer.innerHTML = hours + ':' + minutes.toString().padStart(2, '0') + ':' + seconds.toString().padStart(2, '0');
        if (totalSecondsLeft === 0) {
            clearInterval(interval);
            localStorage.removeItem(timerid);
            timer.innerHTML = "Time is up!";
            window.location.href = "@Url.Action("timesup", "studentexam")" + "?eId=" + "@Model.ExamId" + "&sId=" + "@Model.StudentId";
            return;
        }
    }, 1000);
}

Done! Now try to test with a new exam.