No, u can't compare 1971 to 1965 or 1962,since after 2 wars in one of which we got complete defeat & in another there was a more of a stalemate situation, Indian leadership finally woke up to the needs of military & importance of defence of the nation. Under the strong leadership of Indira Gandhi, we made every arm of our military more & more powerful each passing day, in 1971 many factors were in our favor like the USSR friendship treaty, local Bangladeshi help, no interference from China or US, strong military leadership under Sam Manekshaw, etc., helped us achieve a massive victory. The main reason why we won '71 was that we came to realize our true power, which was not at all visible in either 1962 or 1965.