How many people can pass CA or engineering if EVERYONE could try it? Less than 5% for sure, maybe 1-2%, who knows! Of course, with CA, people can't just appear for it, there is a process to get involved in it whereas with trading, anybody can open a trading-account & dream of becoming the creme-de-la-creme of trading, which is why failure-rate SEEMS high in trading but as @sanju005ind has said, it really isn't.