Since investing interests me, and I hadn't heard of "prop trading", I poked around. I don't think the admission fee gives you a real trading account with real money that reaches live markets. Consider the 4% drawdown on $25,000 I saw on one website: they cut you off after you lose $1,000. And you pay about $150 for that privledge ... does it make any sense that a company loses $850 every time someone joins and sucks at trading? Or does it make more sense that the $25,000 is play money, and the loss of $1,000 not a real money loss... and they just pocket your $150. The latter makes more sense to me.
Brokerage firms with trading software usually offer the option for a "paper trading" account using play money for free. If you think you're skilled at trading, you can find out for free using paper trading. Even if you want to pay money to "prop traders", you should practice for free before you pay money.