I have already taken the Suzuki Teacher Training for Books 1 through 4 on violin. In order to pass the basic audition for the Suzuki Association, you must submit a video of you performing the third movement of the Vivaldi concerto in A minor and one of the Seitz concertos from Book 4. I have posted a portion of my audition tape to YouTube.
The intermediate level audition for training through book 8 requires you to play the entire Bach A minor concerto for violin. The comprehensive audition that allows you to take any can be your choice of the Mozart Violin Concerto No. 4 or 5. I plan on learning the Bach A minor and also the Mozart Concerto No. 5 at some point in the future. It is difficult to say which I will prepare for the audition. I think it is beneficial to take your time with the Suzuki auditions and prepare the piece to the highest level you can.