Belgium (French & German regions) (not adjudicated)
United Kingdom (England, Wales & Northern Ireland)

At least one sometimes but neither always considered

BEL: Flanders/Gen Ed only/private subsidized
BEL: Flanders/Gen Ed only/network comm. schls
BEL: Flanders/Gen Ed and other type/private subsidized
BEL: Flanders/Gen Ed and other type/network comm. schls
BEL: Flanders/Tech/Voc/no Gen Ed/ private subsidized
BEL: Flanders/Tech/Voc/no Gen Ed/network comm. schls
BEL: Flanders/Spec Ed/ private subsidized
BEL: Flanders/Spec Ed/network comm. schls
BEL: Flanders/Part-time Voc/ private subsidized
BEL: French com/Regular/public at state/community level
BEL: French com/Regular/public at local level
BEL: French com/Spec Ed/private sectarian
BEL: French com/Spec Ed/public at state/community level
BEL: French com/Spec Ed/public at local level
BEL: French com/Spec Ed/private non-sectarian
BEL: French com/Part-time Voc/private sectarian
BEL: French com/Part-time Voc/public at state/community level
BEL: French com/Part-time Voc /public at local level
BRA: DISTRITO FEDERAL - grade 9, SMOP=53
BRA: MATO GROSSO DO SUL - grade 9, SMOP=1
BRA: MATO GROSSO DO SUL - grade 9, SMOP=53
BRA: RIO GRANDE DO NORTE - grade 9, SMOP=1
BRA: RIO GRANDE DO NORTE - grade 9, SMOP=53
BRA: RIO GRANDE DO SUL - grade 9, SMOP=1
BRA: RIO GRANDE DO SUL - grade 9, SMOP=53
QCN: Upper secondary/ General/ Experimental Model schools
QCN: Upper secondary/ General/ Ordinary schools
QCN: Upper secondary/ Vocational/ Key schools
QCN: Upper secondary/ Vocational/ Non-Key schools
TAP: general junior high school/public/urban
TAP: general junior high school/public/rural
TAP: general junior high school/private/urban
TAP: general junior high school/private/rural
TAP: general senior high school/public/urban
TAP: general senior high school/public/rural
TAP: general senior high school/private/urban
TAP: general senior high school/private/rural
TAP: vocational senior high school/public/urban
TAP: vocational senior high school/public/rural
TAP: vocational senior high school/private/urban
TAP: vocational senior high school/private/rural
TAP: mixed general and vocational senior high school/public/urban
TAP: mixed general and vocational senior high school/public/rural
TAP: mixed general and vocational senior high school/private/urban
TAP: mixed general and vocational senior high school/private/rural
HRV: 2 - Vocational - industrial - crafts prog.
HRV: 6 - Primary schools (lower secondary education)
FIN: Swedish speaking, urban, school types 1 and 2, MR_ST=2
FIN: Swedish speaking, urban, school types 3, 4, and 5, MR_ST=3
FIN: Swedish speaking, rural, school types 1 and 2, MR_ST=2
FIN: Swedish speaking, rural, school types 3, 4, and 5, MR_ST=3
FRA: lycée général et technologique, ENR>=32
FRA: moderately small school, 16<=ENR<32
GRC: ORIGSTRT 02:  12 - Central Greece public
GRC: ORIGSTRT 03:  13 - Central Macedonia public
GRC: ORIGSTRT 05:  15 - East Macedonia public
GRC: ORIGSTRT 08:  18 - Ionian Islands public
GRC: ORIGSTRT 09:  19 - North Aegean public
GRC: ORIGSTRT 10:  20 - Peloponnese public
GRC: ORIGSTRT 11:  21 - South Aegean public
GRC: ORIGSTRT 13:  23 - West Greece public
GRC: ORIGSTRT 14:  24 - West Macedonia public
GRC: ORIGSTRT 16:  26 - Rest of Greece private
GRC: ORIGSTRT 17:  27 - All of Greece evening schools
ITA: [Sub 08] Piemonte FORMAZIONE PROFESSIONALE
ITA: [Sub 07] Lombardia FORMAZIONE PROFESSIONALE
ITA: [Sub 06] Liguria FORMAZIONE PROFESSIONALE
ITA: [Sub 21] VALLE D'AOSTA PROFESSIONALI
ITA: [Sub 21] Valle D'Aosta FORMAZIONE PROFESSIONALE
ITA: [Sub 13] VENETO FORMAZIONE PROFESSIONALE
ITA: [Sub 12] Trento FORMAZIONE PROFESSIONALE
ITA: [Sub 01] Bolzano FORMAZIONE PROFESSIONALE
ITA: [Sub 05] FRIULI VENEZIA GIULIA LICEI
ITA: [Sub 05] FRIULI VENEZIA GIULIA TECNICI
ITA: [Sub 05] FRIULI VENEZIA GIULIA PROFESSIONALI
ITA: [Sub 05] FRIULI VENEZIA GIULIA MEDIE
ITA: [Sub 05] Friuli Venezia Giulia FORMAZIONE PROFESSIONALE
ITA: [Sub 04] EMILIA ROMAGNA PROFESSIONALI
ITA: [Sub 04] Emilia Romagna FORMAZIONE PROFESSIONALE
ITA: [Sub 20] Umbria FORMAZIONE PROFESSIONALE
ITA: [Sub 16] Lazio FORMAZIONE PROFESSIONALE
ITA: [Sub 14] ABRUZZO FORMAZIONE PROFESSIONALE
ITA: [Sub 18] Molise FORMAZIONE PROFESSIONALE
ITA: [Sub 11] Sicilia FORMAZIONE PROFESSIONALE
MAC: Public, Grammer-International, Chinese and Portuguese
MAC: Private-in-net, Grammer-International, Chinese and English
MAC: Private-not- in-net, Grammer-International, Chinese
MAC: Private-not- in-net, Grammer-International, Chinese and English
MEX: AGUASCALIENTES, moderately small schools
MEX: BAJA CALIFORNIA, moderately small schools
MEX: BAJA CALIFORNIA, very small schools
MEX: BAJA CALIFORNIA SUR, moderately small schools
MEX: BAJA CALIFORNIA SUR, very small schools
MEX: COAHUILA DE ZARAGOZA, large schools
MEX: COAHUILA DE ZARAGOZA, moderately small schools
MEX: COAHUILA DE ZARAGOZA, very small schools
MEX: CHIHUAHUA, moderately small schools
MEX: DISTRITO FEDERAL, moderately small schools
MEX: DISTRITO FEDERAL, very small schools
MEX: GUANAJUATO, moderately small schools
MEX: MICHOACAN DE OCAMPO, moderately small schools
MEX: MICHOACAN DE OCAMPO, very small schools
MEX: NUEVO LEON, moderately small schools
MEX: QUERETARO DE ARTEAGA, large schools
MEX: QUERETARO DE ARTEAGA, moderately small schools
MEX: QUERETARO DE ARTEAGA, very small schools
MEX: QUINTANA ROO, moderately small schools
MEX: SAN LUIS POTOSI, moderately small schools
MEX: SAN LUIS POTOSI, very small schools
MEX: TAMAULIPAS, moderately small schools
MEX: VERACRUZ IGNACIO DE LA LLAVE, large schools
MEX: VERACRUZ IGNACIO DE LA LLAVE, moderately small schools
MEX: VERACRUZ IGNACIO DE LA LLAVE, very small schools
MEX: ZACATECAS, moderately small schools
RUS: Khanty-Mansijsk autonomous district - Yugra
SVN: STSI - technical educational programmes
SVN: SPI - vocational of medium duration
THA: Office of the Basic Education Commission/Lower secondary
THA: Office of the Basic Education Commission/Upper secondary
THA: Office of the Basic Education Commission/Mixed
THA: Office of the Private Education Commission/Lower Secondary
THA: Office of the Private Education Commission/ Upper Secondary
THA: Office of the Private Education Commission/ Mixed
THA: Department of Education of Bangkok Metropolitan Administration/Lower secondary
THA: Department of Education of Bangkok Metropolitan Administration/Mixed
THA: Bureau of Local Educational Development and Co-ordination/ Lower Secondary
THA: Bureau of Local Educational Development and Co-ordination/Upper Secondary
THA: Bureau of Local Educational Development and Co-ordination/Mixed
THA: Commission of Higher Education/Lower secondary
THA: Commission of Higher Education/Mixed
THA: Vocational Education Commission/ Upper Secondary
TUN: North/West - ISCED 3 & Mixed - Private
TUN: South/West - ISCED 3 & Mixed - Private
TUR: TR1 VOCATIONAL AND TECHNICAL SECONDARY
TUR: TR2 VOCATIONAL AND TECHNICAL SECONDARY
TUR: TR3 VOCATIONAL AND TECHNICAL SECONDARY
TUR: TR4 VOCATIONAL AND TECHNICAL SECONDARY
TUR: TR5 VOCATIONAL AND TECHNICAL SECONDARY
TUR: TR6 VOCATIONAL AND TECHNICAL SECONDARY
TUR: TR7 VOCATIONAL AND TECHNICAL SECONDARY
TUR: TR8 VOCATIONAL AND TECHNICAL SECONDARY
TUR: TR9 VOCATIONAL AND TECHNICAL SECONDARY
TUR: TRA VOCATIONAL AND TECHNICAL SECONDARY
TUR: TRB VOCATIONAL AND TECHNICAL SECONDARY
TUR: TRC VOCATIONAL AND TECHNICAL SECONDARY
GBR: NI/ Maintained selective/North Eastern
GBR: NI/ Maintained selective/South Eastern
GBR: NI/ Maintained non-selective/North Eastern
GBR: NI/ Maintained non-selective/South Eastern
GBR: Wales/Maintained/Powys and South West
GBR: Wales/Independent/Powys and South West
URY: Private General Secondary Education - Metropolitan Area of Montevideo - not border with Brazil
URY: Private General Secondary Education - Province Capitals - border with Brazil
URY: Private General Secondary Education - Province Capitals - not border with Brazil
URY: Private General Secondary Education - Rural areas  - not border with Brazil
URY: Private General Secondary Education - Small cities  - not border with Brazil
URY: Public General Secondary Education - Metropolitan Area of Montevideo - not border with Brazil
URY: Public General Secondary Education - Province Capitals - border with Brazil
URY: Public General Secondary Education - Province Capitals - not border with Brazil
URY: Public General Secondary Education - Rural areas  - border with Brazil
URY: Public General Secondary Education - Rural areas  - not border with Brazil
URY: Public General Secondary Education - Small cities  - border with Brazil
URY: Public General Secondary Education - Small cities  - not border with Brazil
URY: Public Technical Education - Metropolitan Area of Montevideo - not border with Brazil
URY: Public Technical Education - Province Capitals - border with Brazil
URY: Public Technical Education - Province Capitals - not border with Brazil
URY: Public Technical Education - Rural areas  - border with Brazil
URY: Public Technical Education - Rural areas  - not border with Brazil
URY: Public Technical Education - Small cities  - border with Brazil
URY: Public Technical Education - Small cities  - not border with Brazil
URY: Rural Schools with Lower Secondary Degree - Rural areas  - border with Brazil
URY: Rural Schools with Lower Secondary Degree - Rural areas  - not border with Brazil