I think it depends on if they give partial credit for part B. If they give partial credit I would argue around 50% but if the points are all or nothing then i would be pleasantly surprised if the cut off is near 50%.
2 weeks left!
Any one has 2019 Open histogram?
I believe they do give partial credit for Part B. That’s what I’ve deduced from various blog posts, anyway.
Anyone know when finalists will be emailed?
Bumping @certainlycrazy. Has anyone received an email yet?
Results come out April 24th. Best of luck guys!
Yeah I’m screwed. I left almost entire section C blank lmao.
Me too…hopefully we did well on Multiple Choice…
Anyone get their scores or an email yet?
Anyone know at what time results come out today?
Results are out for me!
Same here 124.96 semifinalist
What do you think the average score and the cutoff are?
When do they tell you if you are top 50?
@skompella9892, start with Campbell bio. Other good books are:
Life: The Science of Biology: David E. Sadava, David M. Hillis, H. Craig Heller, May Berenbaum: Books
Peter H. Raven: Plant biology
Brooker Genetics: Analysis and Principles: Robert J. Brooker Professor Dr.: Books
Also Martyna from Biolympiads published a book called How To Prepare for the Biology Olympiad And Science Competitions which is on Amazon https://amzn.to/2M6I4jt. I read it twice and I found there many good tips on olympiad preparation.
@Darwin9 Thank you so much for the reply and information! Do you happen to know if the lessons on biology from Khan Academy would be helpful for the USABO?
In Khan Academy, do the whole Health and Medicine Section (you don’t have to do the stuff about the diseases in each system). Also, do some of the Chemistry stuff in the Chemistry course like Acids/Bases and Reactions.
For the other stuff, like Cell Bio, Plant Anatomy, Ecology, Ethology, and Biodiversity, you should use Campbells. Also, check out the Biolympiads website as that has a lot of good stuff (https://biolympiads.com/).
Hope this helps! 
I left most of Part C blank and ended with a 116 ;(. Anyone know the cutoff?
I think it is 137. Any one has the histogram for semis