online test in asp.net core api and angular

    [Route("api/[controller]")]
    [ApiController]
    public class QuizzController : ControllerBase
    {
        private readonly ApplicationDbContext _context;
        public QuizzController(ApplicationDbContext context)
        {
            _context = context;
        }
        // ===============================
        // CLAIM HELPERS (FAST)
        // ===============================
        private string CurrentUserName =>
            User.Identity?.Name ?? "System";
        private int CurrentDepartmentId =>
            int.TryParse(
                User.FindFirstValue("DepartmentId"),
                out var id)
            ? id
            : 0;
        // List all available tests
        public async Task Index()
        {
            var tests = await _context.Tests.ToListAsync();
            return Ok(tests);
        } //Maybe this action result needs @model IEnumerable
        //public IActionResult QuizList()
        //{
        //   var quiz = _context.Questions.Include(x => x.Answers)
        //       .Select(q => new
        //       {
        //           QuestionText = q.Text,
        //           Answers = q.Answers.Select(a => new SelectListItem(a.Text, a.Id.ToString())).ToList()
        //        }).ToList();
        //    return View(quiz);
        //}
        // Show quiz by TestId
        public async Task Take(int id)
        {
            var test = await _context.Tests
                .Include(x => x.Questions)
                    .ThenInclude(x => x.Answers)
                .FirstOrDefaultAsync(x => x.Id == id);
            if (test == null)
                return NotFound();
            return Ok(test);
        }
        // Handle quiz submission and store attempt 
        [HttpPost]
        public async Task Submit(int testId, int[] selectedOptions)
        {
            var questions = await _context.Question
                .Include(q => q.Answers)
                .Where(q => q.TestId == testId)
                .ToListAsync();
            int score = 0;
            var attempt = new TestAttempt
            {
                UserId = CurrentUserName,
                TestId = testId,
                AttemptDate = DateTime.UtcNow
            };
            foreach (var question in questions)
            {
                var correctOption = question.Answers.FirstOrDefault(o => o.IsCorrect);
                var selectedOptionId = selectedOptions.FirstOrDefault(o => question.Answers.Any(opt => opt.Id == o));
                bool isCorrect = correctOption != null && selectedOptionId == correctOption.Id;
                if (isCorrect) score++;
                attempt.Answers.Add(new UserAnswer
                {
                    QuestionId = question.Id,
                    AnswerId = selectedOptionId,
                    IsCorrect = isCorrect
                });
            }
            attempt.Score = score;
            attempt.IsPassed = score >= questions.Count / 2; // replace with your real pass threshold
            _context.TestsAttempt.Add(attempt);
            await _context.SaveChangesAsync();
            return RedirectToAction("History", new { userId = CurrentUserName });
        }
        // Show attempt history for a user
        public async Task History()
        {
            var attempts = await _context.TestsAttempt
                .Include(a => a.Test)
                .Where(a => a.UserId == CurrentUserName)
                .OrderByDescending(a => a.AttemptDate)
                .ToListAsync();
            return Ok(attempts);
        }
        public async Task Details(int id)
        {
            var attempt = await _context.TestsAttempt
                .Include(a => a.Test)
                .Include(a => a.Answers)
                    .ThenInclude(ua => ua.Question)
                        .ThenInclude(q => q.Answers)
                .Include(a => a.Answers)
                    .ThenInclude(ua => ua.Answer)
                .FirstOrDefaultAsync(a => a.Id == id);
            if (attempt == null)
                return NotFound();
            return Ok(attempt);
        }
    } I want  populate test in angular where users can take, submit  tests, and see their  scores