i’m sure you’ll get answers, but some of them may be meaningless in your situation. Net cost, for instance, is unknowable, as @kelsmom explained
%who graduate in 4 years. That’s a statistic most schools report on, but it may not mean much for your particular child. A major change, a remedial need or a low course grade that puts him out of sequence/doesn’t all him to progress, or an “experience” semester may push him into needing more time even at a school with a very high 4 year grad rate. I think you get a better sense comparing the 4 and 6 year rates.
Refund policy should be available online. Search for the academic catalog. Many of those policies can be found in that document.
Employment rate is a prime example of how to lie with statistics. A certain percent working. In the field? How is the institution defining field? Is bank teller “in the field” for a finance major?
Clery Act info should be easy to get.
What else do I want to know? The retention rate is another number that an institution reports to the fed. More important to me is the persistence rate. Retention is a number that looks at incoming traditional freshman who return as sophomores. Persistence looks at the whole student body, including transfers, non-trads, etc.