I passed the Washington State Broker Exam a year and a half ago. Just like you, I passed the State portion and failed the National. What I did was, I got online and looked up what sections were part of the National portion of the exam. Then I sat down with my book and studied those sections of the book. I also went back to my online classes and read through and retook the tests for those sections. After failing the national portion a couple times, I changed testing sites. Maybe it would help to have someone go through the questions with you? Another suggestion would be to contact your instructor and ask for help. Maybe they will have resources that will be of more help. I hope this helps. Good luck on your exam.