India:
It is hard, you have to plan carefully from start.
1. Found Patliputra on spot, if you move, you don't get free workers.
2. Research iron working, you can finish this before turn 75, and send a warrior to meet Phoenecian, buy masonry+priesthood from them. If you don't do so, you'll get iron late, and there's no benefit researching masonry+priesthood by yourself. There's little chance to get the Oracle, you can try, and it needs iron for hammers.
3. Workers build cottage on floodplains first! Ignore unhealthiness, you'll get it done eventually. You have a chance to occur 'better herb' random event that provides +2 health in ancient era, but we still can prevail without it.
4. Patliputra build library or granary, Dilli and Varanasi build a worker, then Dilli build barracks(if not pre-built), Varanasi build granary, switch to temple after priesthood. Make your way to build both shrines to fulfill UHV #1.
5. Research math - calender - monotheism. You need calender to unleash India's richness. 6 workers is enough to work them one by one. Buy polytheism from Phoenecian by math, and you'll eventually be able to buy alphabet by tons of tech from Greeks. You can also buy monarchy from either Egyptian or respawned Babylonian.
6. Dilli build army to conquer Persia. Indian has the most expansive settler cost(264), so it is better to conquer instead, and you can capture more workers. You still need 3-4 settlers to fill the blank, but you can do it later, not in early stage. By the time you fight Persian, Greek conquerer should be also on stage, so you'll wipe them out with catapults+swordsmen+axemen easily. Next target: Greeks.
7. Raze Shushan, keep all other cities you get in Persia and Babylonia, they'll get silk routes, and will be rich by all your resources. Parsa is a good army-producing center, and if you have luck to get Phrada or other city near the horse, build a lot of spearmen to defend it, a fort in forest-hill is helpful. By this time, barb horse archer and war elephants is going to pillage you, so be prepared. OB with Tamils, their war elephant might help you fighting barbs.
8. If you have spare time, build a settler to settle Hanoi for further expansion into China. Chinese will work some tiles for you, although they may fight you as well, and you don't have much time to concern this.
9. Further city founding plan: Pattala on cotton(NW from Mumbai), Goa on gem hill.
10. Focus on military tech and be prepared for 600 AD. Research aesthetics and theology, switch to Catholicism (if you didn't found it, you may conquer Jerusalem to get it), benefit from Khujajaho.