The interviewer was very cranky and upset from the start. I went to El Monte office,CA and waited for 3 hours to be called. I would sugesst to go at least 2 hours earlier than your appt plust thier is no queue of applicant based on the time at thier application letter. The intervirewer officer told me to lets finish it quiclky since there are lot of cases to deal with but it took 25 minutes to done with the interview. He asked only 3 history questions one writing sentense. history question were : who is our president, branches of our govt. what is the voting age. Not to scare any one but the interviewee started to ask me quesitions about my not registerting with selective services, and that took most of the time. I explained to him that i was not aware of it but he kept insisting that this is not the answer and told me that i am not telling the truth. In response, I told him that i am under the oat and not lying. Saying that made him quite. so remember to remind your interviewer officer that your are under the oath and how could you lie if you need to convience plus you should not lie that will make thing comlicated. Then he dicussed my application, taxes, and all other questions from n-400. at the end I signed my n-400 and he told me that he is going to recommend me for citizenship approval and wait for 2-3 month for oath. Other important thing from interview i learned is to keep the answer short and do not argue with the authority; while giving me the the approval paper the interviewer asked me if i have any question. I asked him to tell me if my finger print and name check has arrived and every thing is complete. In response, he said it is but also since he was upset snatched the approval sheet from me and told me that he could continue my case in pending state if I am not happy with his decision. I was just shocked and apologized to him. Thank God it was over but since then I have been thinking why would he ask me if i have any questions and then get upset. Any way good look to ever one with thier interviews. Also, all history questions are from the INS sample question list, so no worry there.