This is the 3rd series of the Hobby School Olympiad test book. We published the first in 2013 with past tests from 2008, 2009, 2011 and 2012. The second book was published in 2019, featuring tests from 2014, 2015, 2016 and 2017. This book contains the past tests from 2018, 2019, 2021, 2022, and 2023.