overage attendance as a result of grade repetition andor late entry risks reducing participation in education unesco for all other countries with available data this share ranges between and figure bla in the last grade of lower secondary education this share increases for most countries and doubles on average across the oecd from to the share of overage students increases most from the last grade of primary education to the last grade of lower secondary education for argentina by percentage points costa rica by percentage points luxembourg by percentage points and spain by percentage points while it decreases substantially for hungary by percentage points highlighting a high rate of dropout and a drop in enrolment rates for yearolds