Board Thread:Theories and Speculation/@comment-28483190-20160519175825/@comment-3965545-20160519200028

We know that, he had to be put on team Minato, and going by DB4 and the manga/anime current events he took the chunin exam for the first time with Team Minato when they were 9-10, he passes, a year or so later it is taken again and Rin and Obito pass. DB1and2 make him 6 as a Chunin, and the chapter where he chastises Iruka for complaining about letting Naruto take the chunin exams back in part 1, he tells Iruka he became a chunin at 6, so that's the old info which seemed to have been retconned.