Any Ideas?

So I've just started a club called Science Bowl at my school, and for those of you who don't know exactly what Science Bowl is:

Science Bowl is a high school and middle school academic competition, similar to Quiz Bowl, held in the United States. Two teams of four students each compete to answer various science-related questions. In order to determine which student has the right to answer the question, a buzzer system is used, similar to those seen on popular television game shows such as Jeopardy. Questions are asked in the categories entitled Chemistry, Biology, Physics, Mathematics, Energy, and Earth and Space Science.

So that's that. Now, would anyone have any suggestions for study materials, books, websites, etc. that would help? If so, I'm desperately in need of them as my schedule is already swamped with activities and I don't have that much time left to organize it and buy materials. I'm also keen on finding more effective study strategies and practice tips, so any of these would also be appreciated. Thanks in advance!

Also, I've started an organization called You and Me--anyone interested please contact me via comment or whatsoever, the meetings take place at East Cobb Library, Marietta, GA from 2 to 4 on the second Saturday of every month--where a group of Chinese American teens of high school age help teach adopted Chinese children, children of mixed families, and anyone else interested really, to their Chinese heritage. We teach conversational Chinese as well as culture through games, songs, stories, etc. and hold special meetings during major Chinese holidays such as Chinese New Year. If you are interested or know someone who is interested, then come to the meetings and spread the word! Btw, this is our second year as an organization so we do happen to know what we're doing. Thanks for your time~