Education level for Pastors and Elders and similar roles

For 3 years, Jesus taught His Disciples who became Apostles after His death. What kind of education did Jesus gave them? Reading all of the New Testament, I have come to conclusion that Jesus taught them Spiritual matters. The only Apostle that didn't follow Jesus was Paul however, Paul did have extensive education background regarding Jewish Laws that were very useful for God to use Paul when He wrote the letters of the New Testament.