USCIS - Important links for N400


Registered Users (C)
Does anyone know how to obtain the "trip record" from USCIS. I totally forgot the exact date and month of my travel out side usa. I believe I need to furnish the exact date and month over form N-400. I went to canada once by car and the border CIS officer did not stamp my passport. This is an issue as well. Thanks!
Record of my travel in and out of the United States, FOIA
I recently became a US citizen (so happy!), and personally I used this free website that helped me prepare for the citizenship test: They also have preparation for N400.