hslc

 https://www.google.com/search?q=hslc

sslc

 https://www.google.com/search?q=sslc

shift

 https://www.google.com/search?q=shift+school

mentor

 https://www.google.com/search?q=school+mentor

open

 https://www.google.com/search?q=open+school

largest

https://www.google.com/search?q=large+school

https://www.google.com/search?q=largest+schools

https://www.google.com/search?q=largest+schools+in+world

mate

 https://www.google.com/search?q=schoolmate