Round 1:
Classical double bass concerto of your choice, 1st movement with cadenza and 2nd movement
Round 2:
Double bass concerto by Koussevitzky or Bottesini (B minor), 1st movement and 2nd movement

Orchestral parts (tutti)
Beethoven: 5th Symphony, 3rd movement
Beethoven: Symphony No. 9, 4th movement (recitative)
Verdi: Otello, Act 4, figure U
Strauss: Rosenkavalier (figure 154-174)
Mozart: Magic Flute (Overture),
Symphony in G minor, 1st movement
Orchestral parts (solo)
Verdi: Rigoletto, Act 1 No.3
Stravinsky: Pulcinella, 7th movement
Mahler: Symphony No. 1, 3rd movement

The orchestral parts can be found in the booklet Orchester-Probespiel by Schott.