It's a timed written exam on an iPad, Sheppard Air sells a prep kit for it.
Then a HR+technical. The technical is "what is V1" level stuff. Brief an approach. Brief a METAR/TAF, do you need an alternate. When can you descend below DH, what color are runway lights. That's pretty much it.

HR is basic "where do you see yourself in 5 years" material.

The written exam score doesn't matter much. It's mostly if they like you or not.

3-4 hours in Indianapolis, they cater food (usually BBQ), all in all a very nice experience and left a good impression of the company.
You'll get a phone call 1-3 days after if you got the job. If you didn't, chances are you'll never hear back.