UPSC Civil Services Model Paper 4

Per capita income shows living standard and economic status. So, statement 1 is correct.
Literacy rate shows educational achievement and is used in some form in the Human Development Index (HDI). So, statement 2 is correct.
Health indicators like IMR, MMR, malnutrition rate etc. show the general health and well-being of the population and its life expectancy. So, statement3 is correct.