As you have asked about the IBPS Specialist IT officer previous paper answer key, I am giving you information about it, check below for the details

I want to tell you that as the exam are conducted online so there is no answer key available for it.
You can only check the cut off scores and scores of your performance in the test.
There is no answer key available for the online exam.

Cut OFF score:

Post UR

IT Officer ( Scale – I) 68-75
Agriculture Field Officer ( Scale – I) 70-75
Rajbhasha Adhikari (Scale- I) 65-70
Law Officer ( Scale- I) 64-70
H.R/ Personnel Officer ( Scale- I) 68- 75
Marketing Officer ( Scale-I) 70-75

Factors responsible for Cut off:

Difficulty level of examination
Number of participating candidates
Lowest and average marks in the main examination
Last year cutoff trends
Annual Intake
Marking Scheme
Seat availability
Average performance of candidate