John 7:15

It was quite common for Jewish males to read and write. The people do not appear to have expressed amazement at Jesus’ ability to do that. The Judean Jews (cf. John 1:19) marveled at Jesus’ understanding of religious matters (cf. Matthew 7:28-29; Mark 1:22). They knew He had not had a formal theological education under the rabbis (cf. Acts 4:13).

"To the Jews there was only one kind of learning-that of Theology; and only one road to it-the Schools of the Rabbis." [Note: Ibid.]