resit
US /ˌriːˈsɪt/
UK /ˌriːˈsɪt/

1.
take an examination again after failing it
:
•
She had to resit her math exam.
•
Many students choose to resit modules to improve their grades.
1.
an act of taking an examination again
:
•
The university offers a resit opportunity for failed exams.
•
He's preparing for his final resit next month.