Through high school we learned both. I took Spanish all 4 years, but had different teachers throughout that time. Most tests and oral exams would allow either, but I do remember some looking specifically for ustedes.
In university we mostly used ustedes, but I had a professor from Spain who would use vosotros. He never expected us to use it but everyone was expected to understand it when reading or in conversation.
Through high school we learned both. I took Spanish all 4 years, but had different teachers throughout that time. Most tests and oral exams would allow either, but I do remember some looking specifically for ustedes.
In university we mostly used ustedes, but I had a professor from Spain who would use vosotros. He never expected us to use it but everyone was expected to understand it when reading or in conversation.