What was the general education level of the mes in the time of Jesus?

Hi I am writing an article and did not know how to determine the education level of individuals during the time of Jesus. I am uming their intellect potential was/is the same of individuals today. What I am curious about is there a way to compare the two extreme educational levels. As an example: Most individuals had no education. Most individuals had the equivalent education of a second grader in our time. Or most could not read or write but could perform basic math. I would appreciate your insight. Thanks