the emt study app for iphone helped me pass my class final. i read the reviews and some people were saying that the app actually helped them pass the national. gotta remember, its the basic knowledge we have from class, being applied to ANY situation. know the respirations rates, normal systolic, the main type of shock (hypovolemic), how to assess and treat trauma, and the order of your primary and secondary.
good luck, and if your class is ending soon, id take the national as soon as youre done with class.