My code for the JS Conditional Challenge. Bulky, but functional. Any ideas to slim down or otherwise improve it?

/*
Here is a simple 5-question
quiz to help pass the time.
*/
var tally = 0;
var start = prompt("Would you like to play a game?");
  if ( start.toUpperCase() === "YES" || start.toUpperCase() === "Y" ) {
  alert("Okay, there will be five questions. Let's begin!");
  } else {
  document.write("Okay - goodbye!");
  exit();
  }


//Question 1
var answer1 = "1865";
var correctGuess = false;
var question1 = prompt("In which year did former slaves in the United States gain the right to legally marry?");
if ( question1 === answer1 ) {
  correctGuess = true;

} else if ( question1 !== answer1 ) {
  var guessAgain1 = prompt("Try again. Here's a hint: it was the same year in which the Thirteenth Amendment to the Constitution was passed.");
  } if ( guessAgain1 === answer1 ) {
  correctGuess = true;
  }

if ( correctGuess ) {
  document.write("You answered " + answer1 + ". That is correct - excellent!");
  tally += 1;
  console.log(tally);
  } else {
   document.write("Sorry. The year was " + answer1 + ".");
  }

//Question 2
var answer2 = "2";
var correctGuess = false;
var question2 = prompt("If Peter Piper picked a peck of pickled peppers, how many quarts did Peter Piper pick?");
if ( question2 === answer2 ) {
  correctGuess = true;
  } else if ( question2 !== answer2 ) {
    var guessAgain2 = prompt("Oops, that answer was not correct. Try again!");
  } if ( guessAgain2 === answer2 ) {
    correctGuess = true;
  }

if ( correctGuess ) {
  document.write(" Correct, a peck is equal to " + answer2 + " quarts.");
  tally += 1;
  console.log(tally);
} else {
  document.write(" A peck is equal to " + answer2 + " quarts.");
}

//Question 3
var randomNumber = Math.floor(Math.random() * 5) + 1;
var correctGuess = false;
var question3 = prompt("I am juggling between 1 and 5 oranges. Guess how many.");
if ( parseInt(question3, 10) === randomNumber ) {
   correctGuess = true;

} else if ( parseInt(question3, 10) < randomNumber) {
  var guessAgain3 = prompt("You guessed " + question3 + ". That's a little low. Guess again.");
} if ( parseInt(guessAgain3, 10) === randomNumber) {
    correctGuess = true;

} else if ( parseInt(question3, 10) > randomNumber) {
  var guessAgain4 = prompt("You guessed " + question3 + ", which is a little high. Guess again.");
} if (parseInt(guessAgain4, 10) === randomNumber) {
    correctGuess = true;
}

if (correctGuess) {
  document.write(" Yes, I am juggling " + randomNumber + " of 5 oranges - good going!");
  tally += 1;
  console.log(tally);
} else {
  document.write(" Sorry, I am juggling " + randomNumber + " of 5 oranges.");
}

//Question 4
var correctGuess = false;
var question4 = prompt("Here's an easy one. Yes or no: am I wearing pants?");
if ( question4.toUpperCase() === "YES" || question4.toUpperCase() === "Y" ) {
  document.write(" Yes, indeed, I am fully pantsed.");
  correctGuess = true;
} else {
  document.write(" Pants are overrated - you are correct!");
  correctGuess = true;
}

if (correctGuess) {
tally += 1;
console.log(tally); 
}

//Question 5
var correctGuess = false;
var answer3 = "to thine own self be true";
var question5 = prompt("Final question: according to Polonius in Shakespeare's Hamlet, what, above all things, should you do?");
if ( question5.toLowerCase() === answer3 ) {
  correctGuess = true;
} else if ( question5 !== answer3 ) {
  var guessAgain5 = prompt("Try again!");
} if ( guessAgain5.toLowerCase() === answer3 ) {
  correctGuess = true;
}

if (correctGuess) {
  document.write(" You are correct, Polonius said " + answer3 + " . Well done!");
  tally += 1;
  console.log(tally);
} else {
  document.write(" Polonius said " + answer3 + ".");
}


//Tallying the score
document.write(" You correctly answered " + tally + " of 5 questions.");


//Assigning prizes
if ( tally === 5 ) {
  document.write(" You earned a gold crown. Congratulations!");
} 
 else if ( tally >== 3 ) {
  document.write(" You earned a silver crown. Good job!");
} 
 else if ( tally >== 1 ) {
  document.write(" You earned a bronze crown. Nice!");
}
 else {
  document.write("You earned no crown. Thanks for playing!");
}