I'm doing a quiz game I need help. How can I make an array (called random questions) to exit and return to the same are not repeated.

Why didnt you post your code normal? What should the screenshots add?

When posting code, do not post screen shots people can not help much that way. Please format ALL you code properly and paste the code directly into the body of the question. To do that copy the code to your clipboard and press the "101010" button in the toolbar of the UA text editor. This will format the code so it can be easily read in the forum.

using UnityEngine; using UnityEngine.Scene$$anonymous$$anagement; using UnityEngine.UI; using System.Collections;

public class responder : $$anonymous$$onoBehaviour {

 public int idTema;

 public Text pergunta;
 public Text respostaA;
 public Text respostaB;
 public Text respostaC;
 public Text respostaD;
 public Text infoRespostas;

 public string[] perguntas;  // armazena todas as perguntas.
 public string[] alternativaA; // armazena todas as perguntasA.
 public string[] alternativaB; // armazena todas as perguntasB.
 public string[] alternativaC; // armazena todas as perguntasC.
 public string[] alternativaD; // armazena todas as perguntasD.
 public string[] corretas; // armazena todas as alternativas corretas.

 private int idPergunta;

 private float acertos;
 private float questoes;
 private float media;
 private int notaFinal;

 // Use this for initialization
 void Start () {
     idTema = PlayerPrefs.GetInt ("idTema");
     idPergunta = 0;
     questoes = perguntas.Length;

     pergunta.text = perguntas[idPergunta];
     respostaA.text = alternativaA[idPergunta];
     respostaB.text = alternativaB[idPergunta];
     respostaC.text = alternativaC[idPergunta];
     respostaD.text = alternativaD[idPergunta];

     infoRespostas.text = " Respondendo " + (idPergunta + 1).ToString () + " de " + questoes.ToString () + " perguntas! ";
 }
 
 public void resposta(string alternativa)
 {
     if(alternativa == "A")    
     {
         if (alternativaA[idPergunta] == corretas [idPergunta])

         {
                 acertos += 1;
             }
     }
     else if(alternativa == "B") 
     {
         if (alternativaB [idPergunta] == corretas [idPergunta])

                 {
                     acertos += 1;
                 }
       }
     else if(alternativa == "C") 
     {
         if (alternativaC [idPergunta] == corretas [idPergunta]) 

                     {
                         acertos += 1;
                     }
                             
                 }
     else if(alternativa == "D") 
             {
         if (alternativaD [idPergunta] == corretas [idPergunta]) 

                     {
                             acertos += 1;
                         }
                     }    

                      proximaPergunta();
                 
                 }


                 void proximaPergunta()
 {
     idPergunta += 1;

     if (idPergunta <= (questoes - 1)) 
     {            

         pergunta.text = perguntas [idPergunta];
         respostaA.text = alternativaA [idPergunta];
         respostaB.text = alternativaB [idPergunta];
         respostaC.text = alternativaC [idPergunta];
         respostaD.text = alternativaD [idPergunta];
                 
         infoRespostas.text = " respondendo " + (idPergunta + 1).ToString () + " de " + questoes.ToString () + " perguntas! ";
     } 
     else 
     
     {

         media = 10 * (acertos / questoes);
         notaFinal = $$anonymous$$athf.RoundToInt (media);

         if (notaFinal > PlayerPrefs.GetInt ("notaFinal" + idTema.ToString ())) {

             PlayerPrefs.SetInt ("notaFinal" + idTema.ToString (), notaFinal);
             PlayerPrefs.SetInt ("acertos" + idTema.ToString (), (int)acertos);
         }

         PlayerPrefs.SetInt ("notaFinalTemp" + idTema.ToString (), notaFinal);
         PlayerPrefs.SetInt ("acertosTemp" + idTema.ToString (), (int)acertos);
     
     Scene$$anonymous$$anager.LoadScene ("notaFinal" + idTema.ToString ());

             
 }

             }

}