We had people who cracked pythagoras theorem in 800 BCE, its formula is found in Sulbha Sutra dated at 800BCE. But Pythagoras propounded that in 530BCE a good 270 years later.
Similarly we have the value of pi in suryasiddhanta dated 5th to 6 the century BCE but modern scientists could crack it only by 14th CE. That is 1800 years later.
We developed the chemical process for permanent dye for.making Indigo blue and Yellow and red colors. Thereby making colorful clothes around 8th BCE, when rest of the world was wearing offwhite rags.
We developed wootz steel that is still the strongest steel in the world. But because turkish traders bought it from India and sold it in rest of the world it is called damascus steel. Another example is the rust free Iron pillar we know as Vishnu Stambh that is dated 5th CE. Does not have a speck of rust today after 1400 years.
Sushruta samhita has details about anatomy, gyneacology, neonatology, ulcer treatment, fungicides, contagious diseases, orthopaedics and basic surgical interventions.
So we were good in astronomy, theoretical physics, theoretical mathemtics, applied chemistry and mechanical / civil engineering, basic medicine.
But we did not have nuclear weapons, flying chariots, space travel, growing babies in pots and fire pits, speaking monkeys, speaking birds speaking dragons/snakes, Icchadari animals and flying horses.
Most importantly no animal to human head transplant
Just like we dont have them today.