What are some accurate data resources?

[Rachel Mellies]

I’m trying to find accurate data resources for rent prices, home values, property taxes, schools…etc 

There seems to be a lot of variance between the ones I’m using and don’t know which to trust. 
I’ve been using Zillow, Trulia, bigger pockets tools. 
I was using greatschool.org till I looked up my hometown (one of the nicer areas in my whole state) and it said the schools are below average and I definitely wouldn’t say that. So now I don't know if I should trust that resource either. 
I’d love to hear what you all use for your data references!