Here are a list of tips which I find very beneficial for preparing for GD/PI. here is the list of titles; click on the title to open it in a new window.
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I have got a very nice article on global terrorism which could be a topic in your GD. So please go through it so that you can have more number of points to make. After reading this do make some research on various terrorist groups like Naxal, LTTE, ULFA, PLO, IRA, Al-Qaieda, Taliban, Maoists etc. [...]

This is my hard work : this is the reading material which I have collected in 5 months while blogging for MBAtutes. I am sharing my effort with you guys for free, so that you don’t have to login anywhere or spend money on something which is freely available to those who are selling it. [...]

Everyone is waiting for NMAT result today, but they haven’t declared it yet. Officially they should have announced it by now but I don’t know what has happened. Maybe, as I am writing this post, they must be uploading it on their site.
So please wait and hope for the best. I will update you when [...]

SCIT has also come up with its shortlisted candidates. Here is the link:
SCIT SHORTLIST

Best of Luck.