I would like to know whether it is possible to mention specific timeline by which a person can bring few keywords in higher SERP in Google? If yes then how? Please let me know your expertise views.
It depends on your keyword. If you have high competitors keyword then it will take long time to get higher SERP. So i can't say the exactly time to getting high SERP. But in search engine optimization we say it will take approximately 3 to 5 month.
It depends upon the keyword, the hard work and the content of your site you are working in. It will take upto 6 months for most of the sites to reach from no where to the first page of SERP if you are working hard.