Exam Preparation

function examPreparation(input) {
    index = 0;
    let badGrades = Number(input[index]);
    index++;
    let currentBadGrades = 0;
    let summaryGrades = 0;
    let taskCounter = 0;
    let lastTask;
    while (currentBadGrades < badGrades) {
        let taskName = input[index];
        index++;
        if (taskName === "Enough") {
            let averageGrade = summaryGrades / taskCounter;
            console.log(`Average score: ${averageGrade.toFixed(2)}`);
            console.log(`Number of problems: ${taskCounter}`);
            console.log(`Last problem: ${lastTask}`);
            break;
        }
        lastTask = taskName;
        let currentGrade = Number(input[index]);
        summaryGrades += currentGrade;
        index++;
        taskCounter++;
        if (currentGrade <= 4) {
            currentBadGrades++;
        }
        if (currentBadGrades === badGrades) {
            console.log(`You need a break, ${currentBadGrades} poor grades.`);
            break;
        }
    }
}