GRM on a comp comes out low, well that is one data point. 

My goal is to find sales within 1/4 mile and 6 months, but I frequently don't have enough data without pushing out both radius and time. 

You'll have to run a test ad and see what the demand even is in this location and at what price point.

You can do a basic title search on a sheriff sale property like on any other property:  using a title company, attorney, or a visit to the country records office.This county's data may be online and searchable (sometimes for a fee), so you could try that, too.Best of luck!

If they see a wave of listings in a particular area and learn that there is going to be some major drainage work done two years from now that will significantly impact taxes, unless your going to meetings at city hall or live in the neighborhood, those are likely things you may miss.When you do begin to narrow down properties you like, they may be able to provide you with data that will reaffirm your own in regards to comps in the area, ARV, and the direction of price trends. 

-DonOpendoor Data Scientist

While that all makes sense I cant seem to find a consistent answer for an online education and testing option.   

I’m getting ready to take the licensing test in a few weeks and I think it would be really beneficial to start meeting other successful realtors in the Phoenix/Scottsdale area other than just broker interviews.

What general eyes tests do others use.I live in northern NJ. 

Like you mentioned most doing ADU's are keeping the properties so there are few data points for appraisers and they haven't yet received guidelines on how to approach them.