"So, in this competition every student could participate but naturally they will only fight those people who had the same power level as them. Before the main three competitions, naturally every student will get through the examination process where the authority will check the power level of that person and naturally he will be fought under that category.
You can say that in this process nobody could cheat because he needed to go through a hard process and at the same time mang powerful people will be present there and every time they will observe those people. So even if someone wanted to conceal their full power, they wouldn't be able to do that.
You should know that there are many people like my grandfather who had powerful observation techniques and in front of those people you cannot hide your full power even if you wanted to.
