AVL 36: Hidden costs after possession nobody mentions

I thought AVL 36 was a good deal for my family. But yaar, after possession, these 'maintenance charges' and hidden costs are insane! Brochure mein kuch aur tha. Kids ke school options nearby hain, but daily expenses ka kya? Did others also face such unexpected charges post-handover? Matlab, is this common in Gurgaon?