javascript value does not hold / store / add-up

It looks like the following code does not add to the total correct value with answers are correct or not...

/*

1. Store correct answers
   • When quiz begins, no answers are correct */

let correct = 0;

// 2. Store the rank of a player

let rank;

// 3. Select the <main> HTML element

const main = document.querySelector('main')

/*

1. Ask at least 5 questions
   • Store each answer in a variable
   • Keep track of the number of correct answers */

const Q1 = prompt('What is the answer fo Question_1'); if ( Q1.toUpperCase === 'MON' ){ correct += 1; } const Q2 = prompt('What is the answer fo Question_2'); if ( Q1.toUpperCase === 'TUE' ){ correct += 1; }

const Q3 = prompt('What is the answer fo Question_3'); if ( Q1.toUpperCase === 'WED' ){ correct += 1; }

const Q4 = prompt('What is the answer fo Question_4'); if ( Q1.toUpperCase === 'THUR' ){ correct += 1; }

const Q5 = prompt('What is the answer fo Question_5'); if ( Q1.toUpperCase === 'FRI' ){ correct += 1; }

/*

1. Rank player based on number of correct answers
   • 5 correct = Gold
   • 3-4 correct = Silver
   • 1-2 correct = Bronze
   • 0 correct = No crown */

if ( correct === 5 ) { rank = "Gold"; } else if ( correct >= 3 ) { rank = "Silver"; } else if ( correct >= 1 ) { rank = "Bronze"; } else { rank = "Nothing"; }

// 6. Output results to the <main> element

main.innerHTML = You got ${correct} out of 5 questions correct. Great you are ${rank};