Hey, r/mumbai! I will soon move to Mumbai for my dad's new job

I am an American teen, and my Dad got transferred to Mumbai. The school I will attend is The American School Bombay aka ASB. Is it good? Is it made up mostly of posh kids? Stuff like that is what I am worried about. I am a Desi, but I don't look the part, you could say. I move in a few months, so I am asking for tips because, well I've been to Mumbai, what like 2-3 times. Please give me tips on life in Mumbai, what phone to get there(I don't have a phone, so they decided to get me one when we moved), and most importantly tips on ASB. Btw, i have family close by, so that's a plus, I suppose(I'm not really close to them, because they are...I guess traditional, too traditional, also I don't see them much). Please give me a lot of tips! Feel free to ask questions! :)