Well, I am no expert, BUT I can tell you that there have been hundreds and hundreds of people who are or have been whitelisted officers. Every single one of them passed it. The answers are there. I would take time to thoroughly read through the documents and watch the video again a few times. If I remember correctly from a few years ago when I did mine, some of the questions are also common sense questions so even though the answers are not written word for word, you should be able to find the answers just fine.
I also failed mine the first time, don't get so worked up about it, you will pass eventually.