I would discourage practicing answers. It is very clear for the interviewer when an answer isn't spontaneous and sincere.
That said, thinking through things like why do I want this job, what's good about the company, and what are my skills that makes me suitable for the job, is good. And if you find out something bad about the company, don't bring it up!
/Mats
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Interests: Comic books, Manga; most things to do with Handicraft, wood, textile, metal etc, modern materials; horror, true crime; languages, art, and history to an extent
Uninterests: All things about motors; celebrities; fashion; sports; career; stock market
Feel free to PM me!