Student ID     Course Code       Mark
   1              C001            88
   1              C002            71
   2              C003            67
   3              C002            92
   3              C001            66
   3              C004            70
   4              C004            65

WR ID        K ID        Course Code
SP-RS-01     K001        C002, C004
SP-RS-01     K004        C002
SP-RS-02     K005
SP-RS-03     K004        C003, C004
SP-RS-03     K006        C001

Student ID       Courses           KID              WR ID
  1             C001, C002        K006              SP-RS-03
  2             C003              K004              SP-RS-01, SP-RS-03
  3             C001, C002, C004  K001, K006        SP-RS-01, SP-RS-03,
                                  K004x2
  4             C004              K004              SP-RS-01, SP-RS-03