In your case, you should have graduated from a technical secondary school and studied in a university (not to the graduation period, not to the degree). Therefore, if a graduate student writes about a technical secondary school, it means writing about where the primary school went, where the junior high school went, and so on. And you can write it to the university, but make it clear that you are a dropout, because it is also a learning experience, but you didn't graduate. Your school should have issued you an associate degree certificate, right?