Faridabad 3BHK: Insider tips for negotiating prices

Did a site visit to Sector 35 last weekend, looking for a 3BHK. Goyal Estate Agency wale ne ₹85L ka quote diya, but meri family ka budget around ₹78L hai. Honestly, not sure if this price is negotiable. Kitna realistic discount expect kar sakte hain Faridabad mein? Aur kya hidden charges hote hain jo possession ke time pata chalte hain? Kids' school admission bhi dekhna hai.