How can I tell of an EA is reading history on backtest

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I'm currently backtesting one shown to me. And I'm testing on 99.9% quality data MT4, just like I've tested many previously. But the results on this EA even with the 99.9% data. Are really good way over average returns for example $100 account to $7k in 4 months, no martingale. And results are similar on different pairs. How can I verify if the backtest is reading history?
 
Your topic has been moved to the section: MQL4 and MetaTrader 4
Please consider which section is most appropriate — https://www.mql5.com/en/forum/172166/page6#comment_49114893
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