The OH State Certamen Championship takes place at the annual OJCL Convention in late Feb/early March. Three preliminary rounds and the semi-finals occur on Saturday morning, and the finals are held Saturday night.
For the local and state competitions, the syllabus for the NLE is the basic guideline for the difficulty of questions for the different levels. Intro to Latin & Level 1 for Novice, Level 2 for Intermediate, and Levels 3-5 for Advanced.
Here are the rules for the OJCL State Championship (2017).