however the share of repeaters exceeds in argentina costa rica luxembourg and spain figure b see source section at the end of this indicator for more information and annex for notes fhttndxdoi the largest increase in the share of repeaters at upper secondary level is observed in the czech republic percentage points higher than for lower secondary programmes and mexico percentage points higher conversely the share of repeaters is lower at upper than at lower secondary level in argentina colombia costa rica greece and the slovak republic the number and share of overage students are a complementary metric to those of repeaters overage students in the last grade are those who are likely to start the next educational level with at least a twoyear delay compared to the intended age the number of repeaters and overage students are strictly linked as in most countries the main reason for a high share of overage students is the accumulation over different grades of students who have repeated at least one year ie the marginal increase in the number of overage students at each grade is correlated with the number of repeaters at that grade