Is it true that most students go abroad only after 11th and 12th grades, and not after polytechnic in UK/Australia for a Diploma?

Yes, most students choose to go abroad after completing 12th grade, not after a polytechnic diploma.

International universities generally offer direct entry into undergraduate programs for students with a 12th-grade qualification. This pathway is widely recognized and accepted in countries like the USA, UK, Canada, Australia, and Germany.

Polytechnic diploma holders may face more limited options, as not all universities accept these qualifications and recognition can vary. If your goal is to study abroad, applying after 12th grade is usually the more straightforward and accepted route.