Vijay,
This is somehow difficult to say. Driving examiners are trained to deliver the highest quality of service to new drivers going for their actual driving test. The majority of the them would pass you if they believe you'll be a good driver and not cause any havoc on the roads. However there may be a small minority who could fail you for any reason (they don't like you, they're having a bad day etc). Although a professional attitude should always be adopted, in reality this does not really happen all the time.
It is difficult to say whether you are right or wrong as no one has witnessed your driving test besides you and the driving examiner. If you feel that you have been wrongly marked down which resulted in you failing your practical driving test, then you can always file a complaint and the DSA will have to investigate what really happened.