You need to clear the written assessment before going to the f2f interview round. The interview is a mere formality. If they are looking for a candidate to fill a place, they will just go for it, even if you do not fare well.
Basics
The following metrics were computed from 1 interview experience for the IBM Senior DBA role in India.
IBM's interview process for their Senior DBA roles in India is incredibly easy as the vast majority of engineers get an offer after going through it.
Candidates reported having mixed feelings for IBM's Senior DBA interview process in India.