Do not try to make mental notes only assuming you will be able to remember all the points you have thought of during the discussion.
Do not waste time trying to frame points in the best possible language you can.
Speaking first can be a double edged sword. If you do not feel like you are ready to make the first point, then do not. It can completely backfire if you speak first without making any valid points resulting in a poor first impression being made in front of the judges.
Do not make an argument based on subjective likes/dislikes or ones that cannot be defended by reason. For eg: “I believe Narendra Modi will be a good leader because he is from the BJP”. Instead you can say “I believe Narendra Modi will be a good leader because he has a proven track record of leadership & economic development for over a decade in Gujarat.”
Do not raise your voice, laugh, ridicule or show anger at a point made by another person even if it is something that does not make sense in your opinion. Even if another person shouts, laughs or ridicules a point you made, do not react in an aggressive or negative manner but calmly defend your point. Similarly do not interrupt another person but wait for him/her to complete his/her point.
Do not lean back in your chair in an overly casual manner or keep fidgeting with your pen or knocking the table. Do not look on the floor or the walls while making your point.
Like in point #3, do not force yourself to say something last if you feel you cannot leave a good last impression with your final views.
How to prepare for Group Discussions:-
Most GD topics are ones which have been in the news recently. Read the news regularly and keep yourself abreast of all major world and national news. Keeping abreast of the news helps one in quoting facts and figures which leave a very strong impression in the minds of the judges. Last minute preparation on topics will not help one much in the Group Discussion and hence it is important to read newspapers regularly. The candidates who do well in this round are generally those who are very well read.
However, many topics for Group Discussions are popular and repeat in the evaluation rounds of many companies/colleges. Hence, making a list of the popular GD topics and thinking through some of the points for each of these topics will help you be better prepared. For eg: Issues of terrorism, gender inequality, poverty, Hindu-Muslim conflicts, liberalization and privatization, reservations in educational institutions etc. often appear as GD topics. A sample list of popular topics is given below.
All the above are basic yet vital tips to help you crack the GD round.