PlayerPrefs always return 0 but health variable is 5,I have a problem PlayerPrefs. It always return zero when it starts. But I assign variable 5

using System.Collections; using System.Collections.Generic; using UnityEngine; using System.Linq; using UnityEngine.UI; using UnityEngine.SceneManagement;

public class GameManager : MonoBehaviour { public Question[] questions; public Text[] TextofChos;

 public Text facttext;
 
 private static List<Question>unanswered;
 private Question CurrentQuestion;
 public bool itistru = true;
 public float health = 5f;
 void Start()
 {
     
     if (unanswered == null || unanswered.Count == 0)
     {
         unanswered = questions.ToList<Question>();
     }
     GetRandomQuestion();
 }
 void GetRandomQuestion()
 {
     //privatehealth = starthealth;
     health = PlayerPrefs.GetFloat("Health");
     int randomQuestionIndex = Random.Range(0, unanswered.Count);
     CurrentQuestion = unanswered[randomQuestionIndex];
     facttext.text = CurrentQuestion.fact;
     for(int i= 0; i<=3; i++)
     {
         TextofChos[i].text = CurrentQuestion.choisestext[i];
     }
 }
 IEnumerator TransitionToNextQuestion()
 {
     unanswered.Remove(CurrentQuestion);
     yield return new WaitForSeconds(0);
     PlayerPrefs.SetFloat("Health", health);
     SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);
     health = PlayerPrefs.GetFloat("Health");
     Debug.Log(health);
   
 }

 // Update is called once per frame
 void Update()
 {
   
 }
 public void A()
 {
     
     if(CurrentQuestion.TrueAnswer == 'A')
     {
         Debug.Log("A");
         
     }
     else
     {
         health -= 1;
         Debug.Log("Wrong");
         
     }
     
     StartCoroutine(TransitionToNextQuestion());
 }
 public void B()
 {
     if (CurrentQuestion.TrueAnswer == 'B')
     {
         Debug.Log("B");
         
     }
     else
     {
         health -= 1;
         Debug.Log("Wrong");
         
     }
     
     StartCoroutine(TransitionToNextQuestion());
 }
 public void C()
 {
     if (CurrentQuestion.TrueAnswer == 'C')
     {
         Debug.Log("C");
         StartCoroutine(TransitionToNextQuestion());
     }
     else
     {
         health -= 1;
         Debug.Log("Wrong");
     }
     
     StartCoroutine(TransitionToNextQuestion());
 }
 public void D()
 {
     if (CurrentQuestion.TrueAnswer == 'D')
     {
         Debug.Log("D");
         
     }
     else
     {
         health -= 1;
         Debug.Log("Wrong");
     }
    
     StartCoroutine(TransitionToNextQuestion());
 }

}