Heyo,

Have you tried the following Lineup?

If not, this team is a solution, just be a bit patient and put Gaara's Barrier up, Naruto Sage mode can hit a dodger 100% with his double Rasengan, so Kurama Naruto should be take fatal damage or even be down after you use Killerbee on Sage Naruto. Round 2, you should have enough chakra generated from the chases to be able and launch Gaara's Mystery, which should do a lot of damage, try to target Temari with him, she is really a problem in this exam as well. Once you've done that, follow the flow with the battle and you should be fine. Additionally, with this Lineup, Itachi Susano'o should basically chaos the Naruto clone which will appear next to Gaara.

Hope that helps and Good luck!

Kushina does work better than Naruto, that's true