Hello Sachin,
Thanks for having reached out on the forum.
I would encourage you to take a look at the
Citizens Information website as this summarizes the different options for acquiring Irish citizenship, together with the necessary conditions to be met in order to do so. For more information about applying for citizenship through Irish descent or association, you can take a look at the
Department of Justice website here.
You'll also find on the previously mentioned Citizens Information website some details regarding
coming to study here.
Wishing you the best of luck,
Alex