Just sharing my solution. It seems like there's a lot of room for creativity!

var answer1 = 60; // minutes in an hour
var answer2 = 24; // hours in a day
var answer3 = 7;  // days in a week
var answer4 = 52; // weeks in a year
var answer5 = 10; // years in a decade
var score = 0;    // user score

//Question set 1
var guess1 = parseInt(prompt("How many minutes in an hour?"));
if (guess1 === answer1) {
    score += 1;   // rather than score = score + 1
  alert("That's right! Your current score = " + score);
} else {
  alert("Sorry Charlie! Your current score = " + score);
}
//Question set 2
var guess2 = parseInt(prompt("How many hours in a day?"));
if (guess2 === answer2) {
    score += 1;   // rather than score = score + 1
  alert("Nailed it! Your current score = " + score);
} else {
  alert("DOH! Your current score = " + score);
}
//Question set 3
var guess3 = parseInt(prompt("How many days in an week?"));
if (guess3 === answer3) {
    score += 1;   // rather than score = score + 1
  alert("Good job! Your current score = " + score);
} else {
  alert("Ohhh they let you out in public? Your current score = " + score);
}
//Question set 4
var guess4 = parseInt(prompt("How many weeks in an year?"));
if (guess4 === answer4) {
    score += 1;   // rather than score = score + 1
  alert("Check out Einstein over here! Your current score = " + score);
} else {
  alert("HASHTAG FAIL! Your current score = " + score);
}
//Question set 5
var guess5 = parseInt(prompt("How many years in an decade?"));
if (guess5 === answer5) {
    score += 1;   // rather than score = score + 1
  alert("MENSA MATERIAL! Your current score = " + score);
} else {
  alert("Bless your heart... Your current score = " + score);
}
//Final Score is...
document.write("Your score is a whopping " + score + "! Way to go?! ");

//Medal Ceremony
if (score === 5) {
  document.write ("You get a GOLD MEDAL!");
} else if (score === 3 || score === 4) {
  document.write ("You get a SILVER MEDAL!");
} else if (score === 1 || score === 2) {
  document.write ("You get a Bronze MEDAL!");
} else {
  document.write ("You get a participation sticker!");
}

/* 
Quiz:
ask 5 questions
   2. keep track of correctly answered questions
   3. final message after quiz with number of correct answers
   4. rank player
    a. all 5 correct = gold crown
    b. 3/4 correct = silver crown
    c. 1/2 correct = bronze crown
    d. 0 correct = no crown
*/
//Question 1:
var correctAnswer = 1+1;
var score = 0;
var answer = parseInt(prompt('What is 1+1?'));
if (answer === correctAnswer) {
  alert('Answer is correct!');
  score += 1;
} else {
  alert('Answer is wrong!');
}
console.log('Score: ' + score);
//Question 2:
correctAnswer = 8-2;
answer = parseInt(prompt('What is 8 - 2?'));
if (answer === correctAnswer) {
  alert('Answer is correct!');
  score += 1;
} else {
  alert('Answer is wrong!');
}
console.log('Score: ' + score);
//Question 3:
correctAnswer = 22*3;
answer = parseInt(prompt('What is 22 * 3?'));
if (answer === correctAnswer) {
  alert('Answer is correct!');
  score += 1;
} else {
  alert('Answer is wrong!');
}
console.log('Score: ' + score);
//Question 4:
correctAnswer = 80/4;
answer = parseInt(prompt('What is 80 / 4?'));
if (answer === correctAnswer) {
  alert('Answer is correct!');
  score += 1;
} else {
  alert('Answer is wrong!');
}
console.log('Score: ' + score);
//Question 5:
correctAnswer = 12+(3*3);
answer = parseInt(prompt('What is 12 + (3 * 3)?'));
if (answer === correctAnswer) {
  alert('Answer is correct!');
  score += 1;
} else {
  alert('Answer is wrong!');
}
console.log('Score: ' + score);
//Rank:
var rank = 'no crown';
if (score === 1 || score === 2){
  rank = 'Bronze crown';
} else if (score === 3 || score === 4) {
  rank = 'Silver crown';
} else if (score === 5) {
  rank = 'Gold crown';
}
if (rank === 'no crown') {
  document.write('Your score = ' + score + '. You won ' + rank + '!');
} else {
  document.write('Your score = ' + score + '. You won the ' + rank + '!');
}

//5-question math quiz
var welcome = alert("Welcome to the quiz. Please answer 5 questions");
var questions = 5

//question 1. result=8
var question1 = prompt("Question 1: Add number 5 to number 3. What's the result?");
if(parseInt(question1) === 8 ) {
  var questionsCorrect = 1;
  alert("Your result is correct. You answered " + questionsCorrect + " question correctly.");

}
else {
  var questionsCorrect = 0;
  alert("Your result isn't correct. You answered " + questionsCorrect + " question correctly.");
}

//question 2. result=5
var question2 = prompt("Question 2: Subtract 5 from 10. What's the result?");
if(parseInt(question2) === 5) {
  questionsCorrect += 1;
  alert("Your result is correct. You answered " + questionsCorrect + " question correctly.");
}

else {
  alert("Your result isn't correct. You answered " + questionsCorrect + " question correctly.");
}


//question 3. result=72
var question3 = prompt("Question 3: Multiply 9 and 8. What's the result?");
if(parseInt(question3) === 72) {
  questionsCorrect += 1;
  alert("Your result is correct. You answered " + questionsCorrect + " question correctly.");
}
else {
  alert("Your result isn't correct. You answered " + questionsCorrect + " question correctly.");
}


//question 4. result=10
var question4 = prompt("Question 4: Divide 72 with 9 and add number 2. What's the result?");
if(parseInt(question4) === 10) {
  questionsCorrect += 1;
  alert("Your result is correct. You answered " + questionsCorrect + " question correctly.");
}
else {
  alert("Your result isn't correct. You answered " + questionsCorrect + " question correctly.");
}


//question 5. result=50
var question5 = prompt("Question5: Multiply 7 and 7 and add 1. What's the result?");
if(parseInt(question5) === 50) {
  questionsCorrect +=1;
  alert("Your result is correct. You answered " + questionsCorrect + " question correctly.");
}
else {
  alert("Your result isn't correct. You answered " + questionsCorrect + " question correctly.");
}

//final message and ranking
document.write("You answered " + questionsCorrect + " questions correctly. ");
if(questionsCorrect === 5) {
  document.write("Congratulations, you are awarded with gold crown.")
}

else if(questionsCorrect===3 || questionsCorrect===4) {
  document.write("Congratulations, you are awarded with silver crown.");
}

else if(questionsCorrect===1 || questionsCorrect===2) {
  document.write("Congratulatons, you are awarded with bronze crown. ");
}

else {
  document.write("You are not awarded with crown, unfortunately.");
} ```

/*
To do:
1. Ask at least five questions - DONE
2. Keep track of the number of questions the user answered correctly - DONE
3. Provide a final message after the quiz letting the user know 
the number of questions he or she got right. - DONE
4. Rank the player. If the player answered all five correctly, 
give that player the gold crown: 3-4 is a silver crown; 1-2 correct answers
is a bronze crown and 0 correct is no crown at all. - DONE
*/

var answer1 = 'Mark';
var answer2 = 'Steve Jobs';
var answer3 = 'Van Schienider';
var answer4 = 'Austin Kleon';
var answer5 = 'Tesla';

var correctAnswer = 0;

// QUestion no. 1

var question1 = prompt('First name of founder of Facebook?');

if(answer1.toUpperCase() === question1.toUpperCase()){
    correctAnswer += 1;
}

// Question no. 2

var question2 = prompt('Who invented the iPhone?');

if(answer2.toUpperCase() === question2.toUpperCase()){
    correctAnswer += 1
}

// Question no. 3

var question3 = prompt('Who was the lead designer of Spotify?');

if(answer3.toUpperCase() === question3.toUpperCase()){
    correctAnswer += 1 
}

console.log('Correct answer : ' + correctAnswer);

// Question no. 4

var question4 = prompt('Author of Steal Like an Artist?');

if(answer4.toUpperCase() === question4.toUpperCase()){
    correctAnswer += 1 
}

// Question no. 5

var question5 = prompt('Created the electricity?');

if(answer5.toUpperCase() === question5.toUpperCase()){
    correctAnswer += 1 
}

//Final Message 

var congratsMessage = document.write('Your total score is : ' + correctAnswer + '</br>');

//Ranking 

if (correctAnswer === 5 ){
    document.write('You earned GOLD Crown for answering 5 consecutive correct answers!');
    console.log('Gold Crowns!');
}else if(correctAnswer > 2 && correctAnswer < 5){
    document.write('You earned SILVER Crown for answering 3-4 consecutive correct answers!');
    console.log('Silver Crowns!');
}else if(correctAnswer > 0 && correctAnswer < 3){
    document.write('You earned BRONZE Crown for answering 1-2 consecutive correct answers!');
    console.log('Bronze Crowns!');
}else{
    document.write("Sorry but you didn't got any correct answer.");
    console.log('No Crowns!');
}

console.log('End of quiz.');

var score = 0;  

alert("Let's see if you know your country capitals. The first one is easy, but it gets harder. Remember, spelling counts! Ready?"); 

/* Prompt: What's the capital of ______?
If user enters correct answer, "Yay. Your score is ___."
  ->If not, a prompt appears with the first letter of the city
  as a clue. 
  ->If second try is correct, alert("Your score is ___")
  ->If second try is wrong, "Sorry. The answer is ____." */

/*Question 1*/
var paris = prompt("What's the capital of France?"); 
if(paris.toUpperCase() === "PARIS") {
    score +=1
   alert("Yay! Your score is " + score); 
} else if (paris.toUpperCase() !== "PARIS") {
     var paris2 = prompt("Try again. It starts with a P."); 
        if (paris2.toUpperCase() === "PARIS") {
          score +=1
          alert("Good. Your score is " + score); 
}         else {
            alert("Sorry. The answer is Paris."); 
}
}

  /*Question 2*/
var canberra = prompt("What's the capital of Australia?"); 
if(canberra.toUpperCase() === "CANBERRA") {
    score +=1
   alert("Yay! Your score is " + score); 
} else if (canberra.toUpperCase() !== "CANBERRA") {
     var canberra2 = prompt("Try again. It starts with a C."); 
        if (canberra2.toUpperCase() === "CANBERRA") {
          score +=1
          alert("Good. Your score is " + score); 
}         else {
            alert("Sorry. The answer is Canberra."); 
}
}

  /*Question 3*/
  var riyadh = prompt("What's the capital of Saudi Arabia?"); 
if(riyadh.toUpperCase() === "RIYADH") {
    score +=1
   alert("Yay! Your score is " + score); 
} else if (riyadh.toUpperCase() !== "RIYADH") {
     var riyadh2 = prompt("Try again. It starts with an R."); 
        if (riyadh2.toUpperCase() === "RIYADH") {
          score +=1
          alert("Good. Your score is " + score); 
}         else {
            alert("Sorry. The answer is Riyadh."); 
}
}

  /*Question 4 */
  var santiago = prompt("What's the capital of Chile?"); 
if(santiago.toUpperCase() === "SANTIAGO") {
    score +=1
   alert("Yay! Your score is " + score); 
} else if (santiago.toUpperCase() !== "SANTIAGO") {
     var santiago2 = prompt("Try again. It starts with an S."); 
        if (santiago2.toUpperCase() === "SANTIAGO") {
          score +=1
          alert("Good. Your score is " + score); 
}         else {
            alert("Sorry. The answer is Santiago."); 
}
}

  /*Question 5 */
  var nairobi = prompt("What's the capital of Kenya?"); 
if(nairobi.toUpperCase() === "NAIROBI") {
    score +=1
   alert("Yay! Your score is " + score); 
} else if (nairobi.toUpperCase() !== "NAIROBI") {
     var nairobi2 = prompt("Try again. It starts with an N."); 
        if (nairobi2.toUpperCase() === "NAIROBI") {
          score +=1
          alert("Good. Your score is " + score); 
}         else {
            alert("Sorry. The answer is Nairobi."); 
}
}

  /*Telling the player what their score is and what crown they get.*/

  document.write("<h1>You answered " + score + " questions right.</h1>"); 
  if (score === 5) {
    document.write("<h1>Congrats! You got a gold crown!</h1>"); 
  } else if (score === 3 || 4) {
    document.write("<h1>Good job. Silver crown for you.</h1>"); 
  }
    else if (score === 1 || 2) {
    document.write("<h1>Ehh. Could have been better. Have a bronze crown.</h1>");
    }
    else {
    document.write("<h1>Wow, really? You need to study your capitals more.</h1>"); 
    }
    ```