A diploma in engineering, whichever branch, from any recognised university or AICTE approved college takes 2 years. You are talking of 3 months.
So are you looking for an accelerated course ? How much can you accelerate a course to reach this type of result ?
Or are you looking for someone who can give you a fake certificate ?
(If so, you are on the wrong forum)
At best, there may be some foreign certification programs, but they are not recognised by the government of india.
20th June 2016 From India, Mumbai