It depends on the notification — many exams require you to have completed the degree by the cut-off date.
If you still have an uncleared backlog at the cut-off date, you are usually ineligible.
Some recruitments allow final-year students, but only if all papers are cleared by the specified date.
Read the eligibility section of the official advertisement carefully.
Never hide a backlog — it will surface at document verification and cancel your candidature.