Do northern Indian people find it difficult to adjust to the top NIT’s in the south?

North Indians may face slight issues while adjusting to the culture and language at South Indian NITs like NIT Warangal.

• Language: There isn't much of a language problem here because most academic conversations are conducted in the English language. However, outside the college, you may find it very difficult to deal with the public, especially the drivers and shopkeepers. If you have some good South Indian friends, they will help you. 
• Food : Usually there is a separate mess for South and North Indian food. But if your college does not have this provision, you will have to adapt yourself to the south indian taste. Students are usually given basic dishes like rice, dal, vegetables, chapati, bread butter etc. with a hint of south Indian flavor in each. For a change, you can sometimes visit canteens or restaurants.
• Culture : Here you won't be able to celebrate Diwali, Holi and Dussehra the way you do in your home state. South Indian festivals like pongal , ugadi, ganesh chaturthi, diwali, holi, saraswati pooja will be celebrated by all. 
• Crowd: South Indians are very friendly, hospitable, and honest. They respect you and your culture and expect the same from you. You will end up with many South Indian friends by the end of your college life. 

It's true, North Indians have to come out of their comfort zones to adapt to the culture at NITs. but once you have adjusted yourself, you will love how diverse your friend group is and the amazing experiences they gave you.