Location: South India
Leaves: Mango Type
Shrubby looking tree/shrub
Spirally arranged stiff (appears evergreen) leaves
Strong midrib on leaf
With over 1000 species worldwide and more than 120 species known to occur in India, the picture likely doesn't have enough detail for someone without specific knowledge of Indian plant species to be able to ID to species. Even an expert might need the following details:
I would recommend reading Mao (2010) The genus Rhododendron in north-east India.
Disclaimer: I am not very familiar with Indian flora, so I could be unaware of genera/species that might be a better fit. Please try using a flora with dichotomous key to ID.