To beat that exam you need to be 53-54k power with 0 nerfs from previous people that beated it (because you absolutely need that very minimum level of power to beat exam 140 and if you don't beat 140 you don't beat neither 180) and you need kurenai, iruka and lee eight inner gates to do it at that power (that even if you are a whale is not said you own them) so there's this unique limitation in time for it to be done (or you need to reach around 70k power and go through it with mb blitz team with an high streak of crits).