If it is Low Leyton and you google those 2words and your computer behaves like mine does the second hit will be a link to British History Online. Search that link for 'academy' and you get:
"147E.R.O., T/P 110/45; L.R.L., L35 Pamphlet, Leytonstone Academy advt. 1785.
Go to the Essex Record Office website (google SEAX) for T/P 110/45 which catalogue entry does not take you any further but a search of that file may do so