Life of Jesus from the age of 12 to 30? There is no scripture that tells about Jesus' life from 12 to 30 years. Is there evidence of Jesus' during this time?
The custom during the time was that men would prepare and study to become a rabbi. Throughout the New Testament Jesus is referred to as "rabbi" and "teacher" such as in John 3:2


  2The same came to Jesus by night, and said unto him, Rabbi, we know that thou art a teacher come from God: for no man can do these miracles that thou doest, except God be with him.


Jesus was preparing himself to become a rabbi so that he could lead His people to salvation.