I'm from Russia, and in the US I attended GCPM - a "correspondence program" with math assignments sent to me by mail and later graded by a university professor.

I'm from Russia, and in the US I attended GCPM - a "correspondence program" with math assignments sent to me by mail and later graded by a university professor. Was a great learning experience (the program had dedicated books and interesting math problems to explore). https://www.egcpm.com/ https://www.egcpm.com/ - Gelfand Correspondence Program In Mathematics