A green card marriage interview is a meeting you may need to have with immigration officials when you are seeking permanent residency on the basis of your marital status. Your spouse may be a U.S. citizen, for example, while you came to the United States on a student visa or an employment visa. To keep your family together, the government may issue you a green card.
The goal of the interview, then, is simply to establish that your relationship is genuine and authentic. The government is concerned about green card marriage fraud. They do not want couples who are not actually in a romantic relationship to pretend that they are married so that one person can obtain a green card. During the interview, the officials just want to see that you are in a true relationship and that the green card is warranted.
You cannot study for the interview
What this means is that, while you can prepare in advance, there is nothing to study. There is no set list of questions you are going to be asked. With a naturalization test, there is a civics component where you will be asked questions about history and government procedures, so you can study. But a green card marriage interview is different.
Often, what the officials are really looking for is simply that you and your spouse give consistent answers that make sense for your relationship. The questions posed may be relatively basic, like asking how you divide roles in the home, where you like to go out to eat, where you went on your first date or if you have plans to have children in the future. As long as you both provide consistent answers, that can show that you have an authentic relationship.
Navigating the immigration process can be complex. If you run into any complications, it can be very helpful to work with an experienced immigration attorney.