To calculate the UNN (University of Nigeria, Nsukka) Post-UTME aggregate score, you must combine your UTME (Unified Tertiary Matriculation Examination) score, O’Level results, and Post-UTME score. UNN typically uses a weighted average, where UTME and Post-UTME each contribute a percentage, and O’Level results also contribute a smaller percentage.

The Procedure To Calculate UNN Aggregate Score
Take your JAMB mark out of 8
Break down your Post-UTME into half
Combine the two scores obtained as a result of division
This will be your UNN cumulative score
The formula is this:
Aggregate Score = [JAMB Score / 8] + [Post-UTME Score / 2]
Important: UNN will consider 50 percent of what you scored in UTME and 50 percent of your Post UTME. Equally so important

For Example
Imagine you had scored:

JAMB: 240
Post-UTME mark: 60
Calculation:
JAMB: 240 / 8 = 30
Post-UTME: 60/2 =30
Aggregate Score = 30 30 = 60
This implies that your total score is 60 percent.