NTLTC does not have an official Bible Bowl/Bible Quiz Study Guide.
The following are some known resources. NTLTC makes no recommendation as to their helpfulness

1000 questions study material on the current year's book: The Seeker

Heart of America LTC publishes a study guide for download on their website at www.hoaltc.org.

N-Quiz-itor is an online resource for coaches and students. See the website for more information: www.nquizitor.com.