Joining a trading competition is one way to train oneself, increase risk intake level since joining such a competition also means you have to have balls to be able to take losses and move on immediately to the next plan like nothing happened.
But then, one must be ready for whatever outcome before engaging in a trade competition, trading itself is very risky, it's not something newbies should engage themselves in, most especially with large amount of money, except it's an amount they are willing and comfortable to lose, and also understand that in trading competition, there is no guarantee of winning a dime, as there is the possibility that there are other high professionals traders with lots of money that will steal the top spots due to how large their bag is, this is one of the reasons why I myself don't bother myself with such things as participating in trading competitions.
Trading can possibly turn you into an instant millionaire, but it can also mess up your life and ruin all your funds most particularly for beginner traders. But despite all the risks, you can only beat all of them if you are confident enough to flex your trading potentials during a trading competition.