Index: iknow-api/Models/EnrollmentInfo.cs
===================================================================
--- iknow-api/Models/EnrollmentInfo.cs	(revision a92a2a413484ff7d4eb9ff6632fcabdffe2b36f4)
+++ iknow-api/Models/EnrollmentInfo.cs	(revision c2f79d73d7219c8c8bcc00f5badba27a707b22be)
@@ -11,5 +11,6 @@
         public int Id { get; set; }
         public int enrollmentYear { get; set; }
-        public Quota quota;
+        // CS1597 fix: no semicolon after accessor block
+        public Quota quota { get; set; }
         public int MajorId { get; set; }
         public Major? Major { get; set; }
Index: iknow-api/Models/PassedSubject.cs
===================================================================
--- iknow-api/Models/PassedSubject.cs	(revision c2f79d73d7219c8c8bcc00f5badba27a707b22be)
+++ iknow-api/Models/PassedSubject.cs	(revision c2f79d73d7219c8c8bcc00f5badba27a707b22be)
@@ -0,0 +1,20 @@
+namespace iknow_api.Models
+{
+    public enum Grade
+    {
+        Six = 6,
+        Seven = 7,
+        Eight = 8,
+        Nine = 9,
+        Ten = 10
+    }
+
+    public class PassedSubject
+    {
+        public int Id { get; set; }
+        public int SemesterSubjectId { get; set; }
+        public SemesterSubject? SemesterSubject { get; set; }
+        public Grade Grade { get; set; }
+        public DateTime DatePassed { get; set; }
+    }
+}
Index: iknow-api/Models/SemesterSubjects.cs
===================================================================
--- iknow-api/Models/SemesterSubjects.cs	(revision a92a2a413484ff7d4eb9ff6632fcabdffe2b36f4)
+++ iknow-api/Models/SemesterSubjects.cs	(revision c2f79d73d7219c8c8bcc00f5badba27a707b22be)
@@ -14,4 +14,5 @@
         public Subject? Subject { get; set; }
         public User? Professor { get; set; }           
+        public PassedSubject? PassedSubject { get; set; }
     }
 }
Index: iknow-api/Models/User.cs
===================================================================
--- iknow-api/Models/User.cs	(revision a92a2a413484ff7d4eb9ff6632fcabdffe2b36f4)
+++ iknow-api/Models/User.cs	(revision c2f79d73d7219c8c8bcc00f5badba27a707b22be)
@@ -7,5 +7,5 @@
         Admin,
         Professor,
-        Strudent
+        Student
     }