Well if are talking about national institute of speech and hearing then,Below i have mentioned nish courses and tests conducted to get admission in those courses(Bachelor) since you have not specified any course i have provided a LINK to their authentic website where they have listed courses and admission procedure in detail

• All india aptitude test only(AIOT) for DISLI AND DECSE(HI)
• Degree(HI){BSc, B.Com,BFA}-Degree admission competency examination (DACE)
• BASLP - The admission to BASLP is a centralized allotment procedure and its through LBS Centre for Science and Technology
• link to the site http://admissions.nish.ac.in/