I used exam4pilots.org to prep for the written and I also bought a Jeppesen study guide for the written. Go through the Jeppesen book and work all the problems. The written test is pretty much the same as the questions in the work book. Make notecards on everything and study. Go to exam4pilots.org and take the free practice test as many times as you can before you go in and take the real written test. When you get over 90 more than a few times in a row, you can pretty much bet you are ready.