There were 3 local schools we had a very good chance of getting places in: 2 dead certs and 1 good chance. We could also have submitted DS for selective schools within public transport distance (1 easy journey, others long).
There are other local schools we could have got into but didn't apply to as the ones we did visit are closer, have better SATS, better ofsteds and better local reputations.
I was interested in:
Curriculum - triple science, more than 1 MFL possible at GCSE, ditto Geog PLUS history (in some you can only do one).
The way the school dealt with different abilities - through setting, streaming, techniques for mixed ability - and at what stage these were introduced and how often adjusted.
Attitude towards inclusion / SENCO (some mobility issues)
Ethos - evidence of aspirational and inspirational work and projects, opportunities the school took for partnership with external organisations, 'right path for each child' provision - e.g BTECs and other qualifications alongside GCSEs etc, focus of Heads speech, happiness of children showing us round.
Behaviour, enthusiasm, team spirit - amongst children and teachers alike!
We put our nearest school first because it offered the best fit for what we were looking for under all those categories.
We didn't bother with the selective route because we decided that the education on offer at the nearest walkable school would suit our DS very well and that the top sets were comparable to the selective.
So far it has worked out v well and we and DS are happy.