Plz suggest me how i prepare for the gd round of any collage.....

If you have been preparing for B-school entrance exams you need to start reading the newspapers. Also you need to be aware of the major general knowledge events for this year. You can also find some common GD topics on the internet and prepare the same. Following all these you can prepare for GD in less than a month.
Reading the newspaper every day and being updated with the current affairs is essential as most of the GD topics are picked up from news and updates from the business sector. The more you need the broader your vision and understanding of issues will become.

Make it a point to speak in English and enhance your vocal skills so that you dont feel hesitant while speaking on the final day. It will also enhance your ability to express.
You can practice GD with your seniors, fellow applicants or friends who had appeared or will be appearing for GD. there are various coaching institutes that take GD sessions where you can hone your skills for group discussion.

Good Luck!