Academically -
Tutors when needed
Revision courses for exams ditto
High expectations for results and colleges, get them on university open days
Support to make study as easy as possible, including limited screen time, study space
Get in professional support help when needed eg of struggling with focus
Encourage them to do what they see good at or passionate about - and chat to them about it
A language is always useful extra capital,
Cultural capital -
Extra curricular activities
Lots of different experiences in the holiday - go abroad even if to camp, go to museums, theatre, concerts, gigs, festivals
Watch the news, encourage reading, watching good drama or docs, intelligent games playing, listening to music
Talk around the dinner table about the news, arts, science, life in general - this is really important
Independence / confidence
Encourage independence - sleepovers, camps, meeting new people
Walking to school, getting yourself ready for school yourself
Character building stuff like DOE and exchanges, interrailing
Work experience or Sat jobs - not long hours, just as a confidence builder
Do kids cook Fridays - when they cook for you
Contacts
This is a bit harder - but really it’s only major schools that give you a major network
However put them in for activities where they will meet the cohort you want them to meet, and focus on getting them to good universities where they can build a network for themselves
Money
You can’t give them inheritance if you don’t have it, but you can teach them to manage money which is v undertaught
Give them some sort of an allowance and get them to invest part of it
Get them to understand compound interest, investments and pensions
Self care
Make sure they eat properly, look after their teeth and do some kind of exercise. A glossy appearance is more common and exercise far more regularly enforced in the private sector.
If you can get them to get the results, then being at a state school is an advantage