Key to us was pastoral care so we found out about that. How is it organised and staffed. How accessible are they.
We asked about incidences of anorexia and how it was dealt with, if asking now I would ask about self harm.
I would ask about homework policy, but then also ask current pupils because what a school says it does for homework may not actually reflect current practice.
I would ask what gets set and when. I would hope not to hear about streaming on entry to year 7. I would ask how frequently sets are reviewed and how much movement there tends to be. I would ask how they ensure every pupil is encouraged to do the best they can.
I would ask who gets to do triple science and how it is run. (e.g. some schools mandate, some only do accelerated, some only let top 60 pupils or whatever).
I would ask to see the options form for the current y9s (or y8s if they do a 3 year GCSE) to see what flexibility of options they are given.
I don't care about sport, but if I did I would ask how team selection is done and do they run B teams as well as A teams.
I don't care about music but if I did I would ask about orchestras, choirs, windbands etc.
I wouldn't ask but I would notice how pupils move around the school, do they stand back for visitors, is their uniform reasonably neat but not OTT. Are they happy.
I wouldn't ask bit I would notice quality of work on walls. If it is all brilliant does that mean they under value lower achieving pupils.
Our HT says you can tell a lot about a school by the state of the toilets.