And the answers to the twin teaser are...

Abuja - is in Nigeria and welcome to Livingspring International College
Graz - is in Austria and welcome to BHAK School in Bruck an den Mur
Hawkes Bay in New Zealand is home to Hastings Central School
Kampala is capital of Uganda. Welcome to Gayaza High School
Luhansk Oblast in the Ukraine is home to Krasnorechensk Secondary School
Welcome to Trelawny Public School in Mississauga, Canda
Uruguay's Montevideo is home to Saint George's School
Palmetto in the USA is home to Manatee School for the Arts
Poole and Snodland are in the UK home to Winchelsea School, Sylvan First School and Holmesdale Technology College
Shanghai in China is home to Shanghai United International School
Tangerang is in Indonesia. Welcome to Sinarmas World Academy
Uttarkhand is in India. Warm greetings to everyone at G.D.Birla Memorial School
And last but not least Vereeniging: South Africa. Welcome to Milton Primary School