You're better than me BetteK, I'm still short on 7 of them. The best way is usually to ask for clues rather than the answers, then at least you have done some work. Also, when the closing date is still so far off, it makes fundraising more difficult for the quiz setters as apparently they don't sell so may quizzes.
I've sent dozens in over this winter with absolutely no luck, but I do enjoy making my brain work. Often if you leave them for a week the answer just comes to you.
The more you do, the better you get as you can sometimes read the setter's mind, and get to know what techniques they use. Keep trying, it's such a great hobby.