There is one key thread about it: Signals - Reliability
(read this thread especially the first page of the thread).

Signals - Reliability - How do you understand the Reliability Index for Signal providers?
- 2018.12.07
- www.mql5.com
How do i understand the reliability index for signal providers. Discussion about the signals is prohibited on the forum so i can only remind the following - from this thead: metatrader 5 trading signals redefined - are there any reliable signals providers. You can go to the signals page and sort the signals based on reliability for example

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I have made almost 6 months portfolio but don't know about the rules of reliability. my signal shows lower reliability. What can i do to increase it ?? please suggest me
What is the major rules to increase Reliability?