The Chunin Exams will have two parts. And varies each time it is taken.
The First part of The First Chunin Exam is a Race and will take place in Inferno Each team from each village will start at the border of their village and using the Skyline they will end up at the Government building. The First twelve to reach their will qualify for the second part of the Chunin Exams.
However. If a genin manages to defeat 2 other genin in combat they will also qualify for the second part of the Chunin Exams taking the spot of the last of the twelve that won the race. Meaning they will assume the 12th position and if another Genin does that they will be booted out of that position and the new genin will assume it.
Each Village will Have 3 Genin Competing Npc's included personally Idc if your human or not an NPC Can and will defeat you in combat if you slack off and don't take them seriously.
Also! Due to the circumstances surrounding the First Chunin Exams Genin are allowed 3 free Additional Justu untill the exams are over then they will start with only the starting Justu