History Quality

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Hello,

I tried my code in MT5 with BackTest. The histoy quality is low. How can I improve it? I want more than 95% accuracy. I use Demo account and I backtest in Demo account. Many thanks. Regards

 
The history (and quality of the history) depends on the broker.
If you do not like the quality of the data/history provided your broker so - find the other broker (because it is fully related to the broker).
 
if you want 99.9% modality tick data, you need to buy it. it didn't come for free
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