The phrase "secondary academies" refers to schools that provide education to students who are in their teenage years, typically between the ages of 11 and 18. Full definition
About 70 % of secondary academies are known as «converter» academies - and these schools were usually doing well before they became academies. (bbc.co.uk)
Moreover, the proportion of academy chains returning above average levels of attainment for disadvantaged students in sponsored secondary academies has fallen since 2013 with only a small minority of chains showing steady improvement. (edisonlearning.net)
The data, originally from the school workforce census, shows as many as 240 secondary academy teachers earning more than the figure. (schoolsweek.co.uk)