Honestly- I would be a little concerned about this and the night school aspect. This has gone both ways in the past from reading various experiences. I’m thinking you may get away with it because as you say you wrote the exact same exam - but a lot will depend on how the CO looks at the specific requirements. I know for some country specific embassies, they explicitly say that part time high school does not count (example :
https://al.usembassy.gov/visas/immi...tional-employment-qualification-requirements/) Unfortunately Italy only has a few hundred selectees for DV each year so it’s hard to find information, especially about non-standard routes.
Question: would your Italian HS diploma have allowed you entry into a
US university? (I’m assuming yes - but asking because this is the guideline for DV, not a university in your home country.) That answer needs to be yes but by itself is not enough (for example in the US a GED allows you college entrance but is not acceptable for DV.) You didn’t mention a university degree so I’m assuming you don’t have one?