Your resume must have been exceptionally well if you have landed at an interview, but does that ensure getting the job? No. 

Resume is only a representative of who you are, the real work starts when you are sitting in front of the interviewers and you have to convince them how you are most eligible among all other applicants. This is the time where you have to walk the talk.

The first step to ace the interview should be to know why you are there; this means to skim through all the requirements that the applied job has and then aligning your personality accordingly. You can share how you dealt with something relatable in your experience to portray your abilities.

Second step should be to not let the poise slip from your hands. You should be the first person to trust yourself with this job, if you trust yourself enough only then you will be able to convince others for the same with your confidence and composure.

The third and last step should be to show your concern by asking relevant question humbly. This tells the interviewer how much you see yourself in this position or how much do you relate with the organization.

These are only a few main points that should be taken care of, but of course you can always prepare yourself more for the job interview such as updating your LinkedIn, researching about the organization or any current projects they are working on, using the STAR approach and so on.