It depends a bit on how the school operates, what the uniform is, how they do lunches etc but some or all of these -
get his coat off and hang it on a peg with his name on it (they sometimes have a picture instead, but recognising his name would help)
take off his outdoor shoes and put plimsolls on, and vice versa (go with Velcro if you can!)
change from uniform to PE kit and back - polo shirts and elasticated trousers are easier than zips, ties, buttons, but it depends on the school
wipe/blow his nose as required
know he needs the loo, is confident enough to tell teacher and manage everything himself
manage his lunchbox - they will help if they have to but 25 yoghurt pots take time... or manage to carry a tray to a table and eat with cutlery
sit quietly and pay attention when the teacher is explaining what to do, and make at least some attempt at it before needing her help
have some idea about taking turns, not demanding 100% adult attention etc