jounin exam replacement

The current jounin exam is a bit hard. Im having trouble killing fake pain (witch i know is a copy of true pain) using all my combat skills. What chance does a tokubetsu jounin have against pain. Its highly unlikely someone can pass the exam. Saying that. I propose a new exam in witch Four mobs would be created. These four mobs would be immune to attacks from a spec. A jounin should be expected to be able to use something from each specialty to some extent and this system would prove that. This would be a challenge to all players considering one mob would be immune to there main spec.

Ninjutsu - immune to ninjutsu

Taijutsu - immune to taijutsu

Genjutsu - immune to genjutsu

Ninja arts - immune to ninja arts

I agree that this seems reasonable. Given that Pain is no longer the big mob that he used to be, perhaps we should have new mobs created to reflect that. We can give mobs immunities to genjutsu, ninjutsu, taijutsu or ninja arts now, so could do that.