I was fortunate to have passed on the first try, and there is one big thing that helped.
Go to a practice course and pay the 5,000 or so yen to spend a couple hours with an instructor practicing on the course. Then take that receipt/certificate with you when you go to get the license. I think the instructor was really relaxed because he knew I had taken the practice session.
I know few if any who passed the first try without going to the practice session first. It's a must!