USABO qualification rate?

Hi,
I’m thinking about starting to study for the 2017 USABO.
Are there any super textbooks/resources to use for the best results? And how many people qualify for the second round? Semifinalists?
Thanks.

Hey,

Campbell Biology is number 1. Then Raven’s Plant biology, Brooker’s Genetics, Color atlas of Biochemistry, and Albert’s Molecular Biology.
Check out biolympiads.com because they share tips and advice, handouts, worksheets, etc. Also watch Khan’s academy videos https://www.khanacademy.org/science/biology which will help you immensly.