Good state primary & secondary school, safe place to live

[freshnup]

My son is 5 yrs and I am staying away from London. I work in London and spend too much in time & money to get there. I am thinking to move to an area (In London) with better schools. Any ideas as to where we can move with decent state primary and secondary schools, easy commute into London and affordable housing??? Some people told me Bromley and Bexley, but they are big areas and there are good and bad places there.
I am really confused. More than a year I have been thinking to move with no breakthrough.... Please help if you can