Can I make Dua in English, must it be a Surah from Quran?

I don't speak Arabic, therefore if I'm making dua to Allah does it always have to be a surah from the Quran or can I make dua in English anytime too? For example: “O’ Allah please help me to do well on my test tomorrow”, or will I have to find a surah that is related to that? And what about during sujood, can I make English dua during sujood or does it have to be a surah from the Quran?