Ninja Exam level 90 Fire Main Hinata*5, Naruto*3, and Tobi*3
Strategy Round One: Use Hinata's Mastery skill, target Kisame and wait for the next round.
Round Two: Quickly use Tobi's Mastery skill on Kisame, then click on Sasori and use your Main's Mastery skill to seal and stop his Puppet Summoning.
Round Three: This can vary on who you target, but generally you want to target and finish Kisame ASAP using Naruto's Mastery skill. By the end of this round, both Kisame and Sasori should be down.
Round Four: Target Itachi and use Tobi's Mastery skill. The plan from this point forward is to focus your firepower on taking down Itachi as quickly as you can. Use your Main's Mastery skill to interrupt Itachi's Mastery skill as well.
Final Notes: A lot of this relies on quite a bit of luck, but none the less is doable. Tobi needs to dodge at least 2 of Deidara's Mastery skills or just one if Itachi is taken out quickly. I would like to point out that Naruto was not awakened to a Gold+2 like the rest of my team. He was only Gold, everyone else was Gold+2.
I do hope that this helps or at least points some of you in the general direction on how to complete Exam 90. If you have the patience to keep trying the fight, you can win for certain with this team. It's just reliant on Tobi evading Deidara at least once or twice. Happy hunting guys!