One-to-one tuition is worth around five months of additional progress, and the arrangement that produces it — short sessions several times a week, linked to the school's work — is close to the opposite of the hour-a-week model usually sold.
Stranger danger has been deliberately retired by the organisations working on child abduction, because it aims at the wrong people, leaves a lost child unable to ask for help, and relies on a test no child can apply. What replaced it is a rule about going somewhere, and it applies to everyone.