Read up on the company you are interviewing for. Think of what you want out of the job. Come up with sensible questions to ask your interviewer about your role, their way of working, their product and market, etc.
That's it. Companies need to be pretty much begging me on their knees for me to even show up for an interview; so not going to put a lot of effort in them. Really, interviews are about deciding whether you want to take a job that has been offered to you. If they have somebody better (doubtful), I encourage them to sign them as quick as they can.
This definitely will help. I didn't really know too much on the company before applying. I encourage anyone to practice this.
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