My script for my buttons doesn't seem work? HELP!

Hi, I'm a beginner in programming.

I want to make a quiz game. Have a text (for question) and 2 buttons (options for answer). What I want from my code is, every time I click one of my buttons (right or wrong), the question changes to next question in my list. The score is functioning perfectly, but the question and buttons don't want to change. So, I wonder if there's something wrong with my code?

Here's my code :

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine.UI;
 
 
 public class RandomQuestion : MonoBehaviour {
     
     // Use this for initialization
 
     private List<string[]> questions = new List<string[]>();
     private List<int> answerOrder = new List<int>(new int[] { 1, 2 });
 
     UnityEngine.UI.Text Question;
     public Button aButton1;
     public Button aButton2;
 
     public Text test;
 
 
     void DrawInfo()
     {
         Rect rect = new Rect(500, 100, 400, 200);
         Question = GetComponent<UnityEngine.UI.Text>();
         Question.text = questions[0][0];
         aButton1.gameObject.GetComponentInChildren<Text>().text = questions[0][answerOrder[0]];
         aButton2.gameObject.GetComponentInChildren<Text>().text = questions[0][answerOrder[1]];
         
         if (aButton1.IsActive())
         {
             aButton1.onClick.AddListener(delegate { CheckAnswer(answerOrder[0]); });
         }
         if(aButton2.IsActive())
         {
             aButton2.onClick.AddListener(delegate { CheckAnswer(answerOrder[1]); });
         }
     }
 
     private void CheckAnswer(int answer)
     {
         if (answer == 1)
         {
             //handle correct answer
             GameControl.control.score += 10;
         }
         else {
             //handle wrong answer
             GameControl.control.score -= 10;
         }
         NextQuestion();
     }
 
     void OnGUI()
     {
         test.text = questions.Count.ToString();
         //this is just to protect from an empty list... you will need better win/lose conditions.
         if (questions.Count > 0)
         {
             DrawInfo();
         }
         else
         {
             GameControl.control.Tutorial();
         }
     }
 
     void Start()
     {
         // String order: question, correct, wrong
         questions.Add(new string[] { "What in ?", "aa", "bb"  });
         questions.Add(new string[] { "Which of ?", "cc", "dd"  });
         questions.Add(new string[] { "Which of these ?", "ee", "ff"  });
         Shuffle(questions);
         Shuffle(answerOrder);
         GameControl.control.AddTutorials();
     }
 
     void NextQuestion()
     {
         questions.RemoveAt(0);
         Shuffle(answerOrder);
     }
     
     static readonly System.Random rng = new System.Random();
     public static void Shuffle<T>(IList<T> list)
     {
         int n = list.Count;
         while (n > 1)
         {
             n--;
             int k = rng.Next(n + 1);
             T value = list[k];
             list[k] = list[n];
             list[n] = value;
         }
     }
 }

Sorry for my bad English and thank you.