I personally think the best way to know is to get in touch with actual students but also see whether there is conflict of interest.For example, some services get commission from brokers when a trader LOSES money. This is how their business model works.Others don't use that model but it's hard to know if they do or not (usually they only want you to deposit with a broker and most often a very bad broker).
It's best to use advice of your advisor, who you saw trading, otherwise you'll just have whatever you're lucky to get. And an advisor has to be chosen according to his trading results, not based on empty promises.
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