confuse mind wrote:I have confusion whether we should repeat the connection word(parallelism indicator) in the parallel parts of the sentence.

1. relative pronoun
Ram who is intelligent and who runs a start-up will be a millionaire by the end of third quarter.
// is the second who essentail?
The second who is essential.


2. conjunction
Gujarat where many news industries have started and where Narendra Modi rules is setting an example for other states in India
//is the second where essentail
The second "where" is definitely required.

3. prepositional phrase
Ram with his MBA credentials and with his conflict resolution tactics is sure to succeed in his business.
//is the second with essential.
No. The second "with" is not essential.

Also, in all the sentences, you require commas after Ram and after the parallel part of the sentence.
Let me know if this helps