cram school vs institution

Some examples from the web:

• I heard that he's going to cram school for the transfer exam.
• I'm sick of going to cram school.
• He quit cram school with me but changed his mind.
• There's no other place as humiliating as cram school.
• Did you go to cram school?
• It turned out that Shen Chia-Yi stayed behind to study when she didn't have to go to cram school.
• You go to cram school lately?
• Go to cram school if you can't study at home.
• I know the reason you don't want to go to cram school.
• They feel good as long as you go to cram school.
• I've got cram school, sorry
• You know what they call you at the cram school?
• Didn't go to cram school yet?
• What can you do without going to cram school?
• Are you going to the cram school again?
• I go to cram school - Cram school?
• So he got his mum to call in, quit the club... ...and began attending a cram school.

Some examples from the web:

• Sociology. a well-established and structured pattern of behavior or of relationships that is accepted as a fundamental part of a culture, as marriage: the institution ...
• The term "institution" commonly applies to a custom or behavior pattern important to a society, and to particular formal organizations of the government and ...
• 2 a : a significant practice, relationship, or organization in a society or culture <the institution of marriage>; also : something or someone firmly associated with a ...
• The bank institution was famous for having the most secure vault in the country many people from around the world came to deposit their money there.