Indian main problem is lots of population, Demographics of India.

India is the second most populated country in the world with nearly a fifth of the world's population. According to the 2017 revision of the World Population Prospects, the population stood at 1,324,171,354. This is 2nd largest in the world.
India has more than 50% of its population below the age of 25 and more than 65% below the age of 35. It is expected that, in 2020, the average age of an Indian will be 29 years, compared to 37 for China and 48 for Japan; and, by 2030, India's dependency ratio should be just over 0.4.
Further complexity is lent by the great variation that occurs across this population on social parameters such as income and education. Only the continent of Africa exceeds the linguistic, genetic and cultural diversity of the nation of India.
The sex ratio is 944 females for 1000 males (2016) (940 per 1000 in 2011) This ratio has been showing an upwards trend for the last two decades after a continuous decline in the last century.

Image Source: Wikipedia
Birth Rate of India, 1971-2008
India is in a huge risk for more population because more population is more food and more all necessary equipment. But Indian government is trying to solve the problems to create new job source but only peoples can solve their own problems if they try to be hard.
Wishing everyone all the best as always.....
Thanks Sincerely
Ashis Das