How is the citizenship test performed?

To immigrate you don't need a test. That is only in the case of getting your citizenship. That is only available to you after 5 years of a permanent resident. In order to immigrate go to the departmentofstatr.com and look for the emby based in or near your country of origin. There they will tell you what you will need to immigrate. If you don't have a job that will petition you or immediate family here that can petition you then you are slightly out of luck. You can also apply for the green card lottery.