Good luck on your interview. I'm sure you'll do fine. My husband had his interview at the
Ankara Canada Immigration. He didn't do well, but he doesn't speak english and their concerns
were that my husband marrried me just to get a Visa to come to Canada. They didn't believe
we had a genuine marriage. Of course, we didn't know that when he went for his interview.
He wasn't prepared and I didn't know how to get him prepared. I really starting coming on this forum
after the interview LOL. So I guess I missed all the good advice!

Anyways learn everything
you can about your wife's life. eg, where she lives, birthday, the names of her parents, any
children and their birthdays, etc. The most important thing is to show them how much you love
each other. It might be a difficult thing to express this to a stranger bent on disproving your
whole relationship, but do it anyways. In the long run it will be worth it.