how to call testname from repository to service

Question

Controller  
public ActionResult Index(Guid id)

        {

            return View(_service.IndexBuildView(id));

          

        }
Repository

  public List<StudentGradeBook> GetStudentsGradeBook(Guid courseSectionId)

        {

            int roler = (int)CourseSectionRoster.CourseRoleTypes.Student;

            List<StudentGradeBook> lsgb = new List<StudentGradeBook>();

            var result = from p in _context.Person2

                         join cs in _context.CourseSectionRoster on p.PersonId equals cs.PersonId

                         join a in _context.Assignments on cs.CourseSectionId equals a.CourseSectionId

                    

                         join asg in _context.AssignmentSubmission on a.AssignmentId equals asg.AssignmentId into asgn

                         from agn in asgn.DefaultIfEmpty()

                         where a.GradeBook == true && cs.CourseSectionId == courseSectionId && cs.CourseRole == roler

                     

            select new { p.FirstName, p.LastName, a.AssignmentName, a.MakeAvailable, a.PointsPossible, a.DueDateTime, agn.PointsAwarded ,agn.SubmissionDateTime};

            var testresult = from t in _context.Test

                             where t.GradeBook == true && t.CourseSectionId == courseSectionId

                             select new { t.TestName,t.TotalPoints};

            foreach (var item in result)

            {

                StudentGradeBook sgb = new StudentGradeBook()

                    {

                        FirstName = item.FirstName,

                        LastName = item.LastName,

                        AssignmentName = item.AssignmentName,

                        PointsPossible = item.PointsPossible,

                        DueDateTime = Convert.ToDateTime(item.DueDateTime),

                        PointsAwarded = item.PointsAwarded,

                       SubmissionDateTime =item .SubmissionDateTime ,

                     

                    };

                lsgb.Add(sgb);

            }

            foreach (var titem in testresult)

            {

                StudentGradeBook tsgb = new StudentGradeBook()

                    {

                        TestName = titem.TestName,

                        TotalPoints = titem.TotalPoints

                    };

                lsgb.Add(tsgb);

            }

            return lsgb.ToList(); 

          

        }
Service

 public IndexModel IndexBuildView(Guid courseSectionId)

        {

           CourseSection cs = _courseSectionRepo.GetSectionById(courseSectionId);

            IndexModel outer = new IndexModel { CourseSectionId = courseSectionId, CourseName = cs.Course.CourseTitle, SectionNumber = cs.SectionNumber, };

             var res = from asg in _gradebookRepo.GetStudentsGradeBook(courseSectionId) select new StudentGradeBook { FirstName = asg.FirstName, LastName = asg.LastName, AssignmentName = asg.AssignmentName, PointsPossible = asg.PointsPossible, DueDateTime = (DateTime)asg.DueDateTime, PointsAwarded = asg.PointsAwarded, SubmissionDateTime = asg.SubmissionDateTime };

            here how do i call the testname and totalpoints 

            outer.Student = res.ToList();

            

            return outer;

        }
Model

  public class StudentGradeBook

    {

        public Guid PersonId { get; set; }

        public string FirstName { get; set; }

        public string LastName { get; set; }

        public Guid CourseSectionRosterId { get; set; }

        public int? PointsAwarded { get; set; }

        public DateTime? SubmissionDateTime { get; set; }

        public int CourseRole { get; set; }

        public string AssignmentName { get; set; }

        public int PointsPossible { get; set; }

        public DateTime DueDateTime { get; set; }

        public string TestName { get; set; }

        public int TotalPoints { get; set; }

       

    }