PhD in linguistic is a minimum 2 year PhD program in scientific study of various kinds of language. Here is a list of top Institutions for PhD in linguistics

• Varanasi Hindu University
• University of Delhi
• IIT Kanpur
• IIT Kharagpur
• JNU Delhi
• Jadavpur University
• University of Calcutta.

The entrance examination is a national level test. You should have ability of

• good comprehension skills
• analysis of morphemes
• coding decoding
• basic depth in linguistics
• you should have check previous year question papers

hope this will help you