Noida flats: What's the real story on maintenance?

Noida mein flats dekh raha hoon, kids have moved out, don't need such a big place. Victory Ace aur Antriksh Golf City ke maintenance charges ka kya scene hai? Builders often quote low initially, but society RWA form hone ke baad badh jaate hain. Yeh actual total cost kaise figure out karte hain? Especially for a ready project like Victory Ace. Any tips on checking RWA financials?