However I have my doubts on the accuracy of that.

There's lots of considerations from the differences from street to street, to property condition, to utilities, to strategy, to the accuracy of the property taxes, to foundation type, to earthquake damage, to the building age and the building construction methods used at the time, to inspecting for electrolysis on pipes, etc.

That is, if you want 'accuracy'.

Here are some general rules of thumb to expect - although they can vary widely based on the quality of your list.typical match rate  Phones: 50-70% average Email: 30-55% averagethe expectation of accuracy Phone numbers: 75% average Email deliverability: 89% averageAlso remember that you may have had some errors in tracking down the ownership contact info from your driving for dollars.

Here's what I found...BatchSkipTracing.com...PROS... provided 4-8 numbers per property... included "Preferred Mailing Address" columns which gave an alternate mailing address for the owner (which could be useful for mailing campaigns)... each number was given a "Phone Score" of 0-100 (which presumably is a measure of the accuracy or their confidence in the number provided.)... provided email addressesCONS... did not note which numbers were/are part of litigator lists (which I hear can be costly if you call someone on this list)REISkip.com...PROS... provides email addresses... gives up to 3 numbers/property (less can be better)... provides info on which numbers are part of a litigator list... provides property data (info gathered from public records/census data)CONS... some of the data seems unnecessary With that said, it's difficult to say which is "most accurate".

I even went through the comps it pulled, selected those within 0.45 miles and similar BR/BTH/SF, and the ARV went up to $1.27M:This indicates Pellego liklely has too restrictive of filtering setup for their returned comps selections, resulting in poor accuracy of their ARV predictions. 

As for finding out a property's 'zoned' school(s) you will need to do a google search with the following terms;The exact "school corporation name" (often City/Township combo) + "school boundary map"  Usually two to three links will be above the one you're looking for as those top result are PPC ads (like from sites you mentioned) then below those you should see ".gov" ".org" or something State/district specific like "in.us" but it's likely not going to come from a ".com" location if an official State or public school site (which is what you want as redistricting happens often and the State's site will only be second in accuracy after the school district's site. 

In that environment, most of a passive investor’s concerns related to honesty, transparency, accuracy, and timeliness are managed by the administrator who is a neutral party.

Over 90% accuracy for sure on the few hundred thousand skips that I have done.

I used to walk properties with my contractor, my contractor is great but it stopped doing it because it was useless we couldn’t know what issues to anticipate in advance so the 1st bids were worthless, like a 45k bid that turned into 130k, and again not because he was dishonest or anything just modernzing a house has so many different parts you couldn’t possibly imagine, now that said I figured out over time given age of and condition of home I could reliably estimate total cost within like 90% accuracy, so I’d ask around other people in your area what are they spending on a similar type of project, I do this periodically in my market just to make sure I’m not getting screwed but especially when you adjust for quality I kind of found everyone was kind of paying the same.