NDA question paper of English is designed to test a candidate’s understanding of English and usage of words. The syllabus of English covers Grammar and usage, vocabulary, comprehension and cohesion. The book you can prefer Objective General English for Competitive Exams- S.P. Bakshi.

The interview you can give the language you are comfortable. Here are the points you can prefer for the interview:

When you discuss any topic or express your views, you should have logical reasoning to Support your views.
Be clear, original & fluent in expression.
Be properly dressed.
Listen to the questions carefully and do not answer in a hurry. If you have not followed a question, ask for the clarification politely.
Do not bluff.
Do not upset or lose your temper but be courageous.
The last very important Be confident to answer every question.

 

Good Luck!