The following techniques may be adopted:-
Keep abreast of all that is happening around you. 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.
Do not be gloomy and be cheerful.
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.
Never show rigidity of views but be candid.
Do not blame government / organization / institution or a teacher for your shortcomings. Accept them gracefully.