Foreign student in greek high school

Hi there! 🖖My name is sofia. In 1 year I will be 18. 1 am planning to go to Greece when I will reach the legal age. But at that moment I will still have the last 2 years of high school to complete. I have already got a job systemation there, but how can the κλασσικο λυκειο, the analogue school i am attending from Italy, accept me? Do I need a special study visto? I know for sure that in order to get the graduation exam I have to acknowledge the greek language, at least to compose the final essay, or even in oral questioning. How can the school (i dont know if i should go private or public) help me? Will it make an English course, or reduce the language difficulty? For sure I think I will get something like handicap special treatment😅. Should I contact the greek embassy?