How to add sequencing selection and iteration

I was making a game for my class because we had to write a program and because I had experience with unity I decided to make a short little trivia game but now that i am done with the code and I am doing the written segment I just realized that I have to have The first program code segment must be a student-developed procedure that: Defines the procedure's name and return type (if necessary) Contains and uses one or more parameters that have an effect on the functionality of the procedure Implements an algorithm that includes sequencing, selection and iteration

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Timer : MonoBehaviour
 {
     [SerializeField] float timeToCompleteQuestion = 30f;
     [SerializeField] float timeToShowCorrectAnswer = 10f;
 
     public bool loadNextQuestion;
     public float fillFraction;
     public bool isAnsweringQuestion;
     
     float timerValue;
 
     void Update()
     {
         UpdateTimer();
     }
 
     public void CancelTimer()
     {
         timerValue = 0;
     }
 
     void UpdateTimer()
     {
         timerValue -= Time.deltaTime;
 
         if(isAnsweringQuestion)
         {
             if(timerValue > 0)
             {
                 fillFraction = timerValue / timeToCompleteQuestion;
             }
             else
             {
                 isAnsweringQuestion = false;
                 timerValue = timeToShowCorrectAnswer;
             }
         }
         else
         {
             if(timerValue > 0)
             {
                 fillFraction = timerValue / timeToShowCorrectAnswer;
             }
             else
             {
                 isAnsweringQuestion = true;
                 timerValue = timeToCompleteQuestion;
                 loadNextQuestion = true;
             }
         }
     }
 }
 
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class ScoreKeeper : MonoBehaviour
 {
     int correctAnswers = 0;
     int questionsSeen = 0;
 
     public int GetCorrectAnswers()
     {
         return correctAnswers;
     }
 
     public void IncrementCorrectAnswers()
     {
         correctAnswers++;
     }
 
     public int GetQuestionSeen()
     {
         return questionsSeen;
     }
 
     public void IncrementQuestionsSeen()
     {
         questionsSeen++;
     }
 
     public int CalculateScore()
     {
         return Mathf.RoundToInt(correctAnswers / (float)questionsSeen * 100);
     }
 }
 
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using TMPro;
 using UnityEngine.UI;
 
 public class Quiz : MonoBehaviour
 {
     [Header("Questions")]
     [SerializeField] TextMeshProUGUI questionText;
     [SerializeField] List<QuestionSO> questions = new List<QuestionSO>();
     QuestionSO currentQuestion;
 
     [Header("Answers")]
     [SerializeField] GameObject[] answerButtons;
     int correctAnswerIndex;
     bool hasAnsweredEarly = true;
 
     [Header("Button Colors")]
     [SerializeField] Sprite defaultAnswerSprite;
     [SerializeField] Sprite correctAnswerSprite;
 
     [Header("Timer")]
     [SerializeField] Image timerImage;
     Timer timer;
 
     [Header("Scoring")]
     [SerializeField] TextMeshProUGUI scoreText;
     ScoreKeeper scoreKeeper;
 
     [Header("ProgressBar")]
     [SerializeField] Slider progressBar;
 
     public bool isComplete;
 
     void Awake()
     {
         timer = FindObjectOfType<Timer>();
         scoreKeeper = FindObjectOfType<ScoreKeeper>();
         progressBar.maxValue = questions.Count;
         progressBar.value = 0;
     }
 
     void Update()
     {
         timerImage.fillAmount = timer.fillFraction;
         if (timer.loadNextQuestion)
         {
             if (progressBar.value == progressBar.maxValue)
             {
                 isComplete = true;
                 return;
             }
 
             hasAnsweredEarly = false;
             GetNextQuestion();
             timer.loadNextQuestion = false;
         }
         else if (!hasAnsweredEarly && !timer.isAnsweringQuestion)
         {
             DisplayAnswer(-1);
             SetButtonState(false);
         }
     }
 
     public void OnAnswerSelected(int index)
     {
         hasAnsweredEarly = true;
         DisplayAnswer(index);
         SetButtonState(false);
         timer.CancelTimer();
         scoreText.text = "Score: " + scoreKeeper.CalculateScore() + "%";
     }
 
     void DisplayAnswer(int index)
     {
         Image buttonImage;
         if (index == currentQuestion.GetCorrectAnswerIndex())
         {
             questionText.text = "Correct!";
             buttonImage = answerButtons[index].GetComponent<Image>();
             buttonImage.sprite = correctAnswerSprite;
             scoreKeeper.IncrementCorrectAnswers();
         }
         else
         {
             correctAnswerIndex = currentQuestion.GetCorrectAnswerIndex();
             string correctAnswer = currentQuestion.GetAnswer(correctAnswerIndex);
             questionText.text = "Sorry, the correct answer was;\n" + correctAnswer;
             buttonImage = answerButtons[correctAnswerIndex].GetComponent<Image>();
             buttonImage.sprite = correctAnswerSprite;
         }
     }
 
     void GetNextQuestion()
     {
         if (questions.Count > 0)
         {
             SetButtonState(true);
             SetDefaultButtonSprites();
             GetRandomQuestion();
             DisplayQuestion();
             progressBar.value++;
             scoreKeeper.IncrementQuestionsSeen();
         }
     }
 
     void GetRandomQuestion()
     {
         int index = Random.Range(0, questions.Count);
         currentQuestion = questions[index];
 
         if (questions.Contains(currentQuestion))
         {
             questions.Remove(currentQuestion);
         }
     }
 
     void DisplayQuestion()
     {
         questionText.text = currentQuestion.GetQuestion();
 
         for (int i = 0; i < answerButtons.Length; i++)
         {
             TextMeshProUGUI buttonText = answerButtons[i].GetComponentInC$$anonymous$$ldren<TextMeshProUGUI>();
             buttonText.text = currentQuestion.GetAnswer(i);
         }
     }
 
     void SetButtonState(bool state)
     {
         for (int i = 0; i < answerButtons.Length; i++)
         {
             Button button = answerButtons[i].GetComponent<Button>();
             button.interactable = state;
         }
     }
 
     void SetDefaultButtonSprites()
     {
         for (int i = 0; i < answerButtons.Length; i++)
         {
             Image buttonImage = answerButtons[i].GetComponent<Image>();
             buttonImage.sprite = defaultAnswerSprite;
         }
     }
 }
 
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 [CreateAssetMenu(menuName = "Quiz Question", fileName = "New Question")]
 public class + : ScriptableObject
 {
     [TextArea(2,6)]
     [SerializeField] string question = "Enter new question text here";
     [SerializeField] string[] answers = new string[4];
     [SerializeField] int correctAnswerIndex;
 
     public string GetQuestion()
     {
         return question;
     }
 
     public string GetAnswer(int index)
     {
         return answers[index];
     }
 
     public int GetCorrectAnswerIndex()
     {
         return correctAnswerIndex;
     }
 }
 
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using TMPro;
 
 public class EndScreen : MonoBehaviour
 {
     [SerializeField] TextMeshProUGUI finalScoreText;
     ScoreKeeper scoreKeeper;
 
     void Awake()
     {
         scoreKeeper = FindObjectOfType<ScoreKeeper>();
     }
 
     public void ShowFinalScore()
     {
         finalScoreText.text = "Congratulations!\nYou got a score of " + 
                                 scoreKeeper.CalculateScore() + "%";
     }
 }