Here is a useful list of books that will help you prepare for all sections of the Science Bowl.
BIOLOGY
1. The Living Science, Miller-Levine
3. Biology-The Web of Life, Strauss Lisowski
4. Biology, Campbell and Reece
5. How to Prepare for The Biology Olympiad and Science Competitions, Martyna Petrulyte
PHYSICS
1. Contemporary College Physics, Jones
2. College Physics 3rd edition, Wilson
3. Conceptual Physical Science, Hewitt-Suchocki-Hewitt
4. College Physics, Serway and Faughn
MATHEMATICS
1. The Harper Collins Mathematics Dictionary, E.J. Borowski & J.M Borwein
3. Physics: Algebra/Trig Hecht
CHEMISTRY
2. Organic Chemistry, Frank Pellegrini
3. General Chemistry, Umland & Bellama
4. Chemistry, the Central Science, Brown Lemay and Bursten
GENERAL
1. Living in the Environment, G. Tyler Miller, Jr.
2. Asking about Life, Tobin & Dusheck
EARTH
1. Environmental Science, Nebel Wright
2. Earth Then & Now, Montgomery – Dathe
3. Physical Geology, Mark Crawford
4. Earth Science, Tarbuck and Lutgens
ASTRONOMY
1. In Quest of the Universe, Karl F. Kuhn
2. Horizons-Exploring the Universe, Michael A. Seeds