Others have already answered the aspect of your question regarding where to find this - but I thought I would add a little warning about accuracy in general.
First, testimonials that you read are based on the individual's perspective of what was helpful to them, which is a very biased thing indeed. For instance, someone could actually read a situation accurately but, because the querent doesn't want to hear it, they say it is bad or wrong. So the response from the querent can be that it is wrong, even when the message is actually correct. Even readings of the present are subjective because whatever the individual doesn't want to hear is going to be denied or blocked out (some people are better about this than others, admittedly) Then, you can have readings that are actually not accurate, but because the message is what the querent wanted to hear they report that it is in fact accurate. (I imagine that this phenomenon probably would put some professional readers in a hot spot, as they would have to decide if they want to just give accurate readings of the truth, regardless of the querent's response to it, or if they want to read for the parts of the truth that the querent is able to accept to keep their accuracy and customer satisfaction ratings high. I have also met some readers that admittedly make things more positive than they are just so the customers give positive feedback and leave feeling that the reading was accurate.)
Then you have readings of the future. Since the future isn't set in stone, it is rather difficult to gauge the accuracy of these readings as well. For instance, someone could have a very high reported rate of success at reading the future just because it so-happened that what they predicted did come to pass, but that some person could very well have their next predictive reading not come to pass because some element has changed that has caused the most likely thread of possibility to not become reality. You can also have someone who has had pretty low accuracy with predictive readings, but it may be that there were just changing influences that altered what happened, so they may have actually seen what was most likely at the time, but perhaps what they have read for just contained more variability than what other people read for. How could you even tell if this was the case though? So that's extremely hard to gauge. The best people I have ever met at doing prophecy readings are occasionally wrong because of sheer fact that the future isn't set in stone.
There is also the personality dynamic. It may just be that reader's own psychological understanding better matches up with some querent's than others (and thus they can deliver information in a way that is more salient to some people more than others.) For instance, with some people, I can say very little and they just know what I am trying to say because they have a similar understanding of the world. With others, the communication is more laborious as their worldview is so different from my own that certain things are lost in translation. Based on each person's perspective and understanding about the world, the things that are said are going to be more salient and understandable to some types of people over others. This is an extremely complicated topic though, but the gist of it is that some people get along better than others. Some people "click" well and others seem to be speaking separate languages. So even the mode of communication, the way things are worded, and the understandings/perspectives of the reader and querent, and how these mix, can have an impact on the perceived value and accuracy of a reading.
Anyways, best of luck in your search for this elusive beast called accuracy.
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