exam preparation

function examPreparation(input) {
    const badGradesWatchCount = Number(input.shift());
    let badGradeCount = 0;
    let gradeCount = 0;
    let scoreSum = 0;
    let lastProblem = '';
    let hasMetBadGradeCriteria = false;
    while (input.length) {
        const problemName = input.shift()
        if (problemName === 'Enough') {
            finished = true;
            break;
        }
        const problemGrade = Number(input.shift())
        if (problemGrade <= 4) {++badGradeCount }
        if (badGradeCount === badGradesWatchCount) {
            console.log(`You need a break, ${badGradesWatchCount} poor grades.`)
            hasMetBadGradeCriteria = true;
            break;
        }
        lastProblem = problemName;
        scoreSum += problemGrade;
        gradeCount++;
    }
    if (!hasMetBadGradeCriteria) {
        const averageScore = (scoreSum / gradeCount).toFixed(2)
        console.log(`Average score: ${averageScore}`);
        console.log(`Number of problems: ${gradeCount}`);
        console.log(`Last problem: ${lastProblem}`);
    }
}

examPreparation([3, "Money", 6, "Story", 4, "Spring time", 5, "Bus", 6, "Enough"]);