Hey man, sorry, you won't be able to build a decent enough rig for gaming under 30000. Even an office PC is tough at that budget. Let me tell you the cheapest prices of components in India.
CPU - Ryzen 1200 - 8000
Motherboard - cheapest mATX A320 - 5000
RAM - you need 2x8GB for 60+ FPS at FHD - 12000
GFX - GTX 1060 6GB - 24000, 3GB for 19000
We have already crossed 30000 and we have yet to spend on case, PSU, Storage, monitor etc.
At this point you have 3 options:
1) Increase your budget. 60000 for 900p high settings with 1050ti or 75000 with a 1060. Monitor separate
2) For around 40000, you can buy an intel i3 based PC with integrated graphics that will let you play 720p lowest settings
3) The best option. Get a PS4 for around 28000 - 35000 depending on the bundled game(s). Assuming, you already have a FHD TV.
🙁