First of all, u need to clear the aptitude test which consists of 35 questions..80 mins...for that u need to prepare the questions in freshersworld very well..also if you need more such questions, u can email me at pktheking.paul@gmail.com.
I sat for the apptitude around 1.10 pm..the results were declared around 3 pm..I was selected for interview.
Now, as far as the interview is concerned..it was a combined TECH+HR interview. There were nearly 10 panels each consisting 1 Sir/maam...they were in different rooms and around 3:55 I was told by the co-ordinator to go to room no. 312....

Here is the questions I was asked.....

Me : May I come in Sir...
Interviewer : ya sure..
Me : Thank you sir.
Interviewer : (while watching my form)So, Pritam...how's the day going?
Me : It's a fine day sir. But I'm a bit tensed.
Interviewer : why so?
Me : It's my life's first interview sir. 
Interviewer : (smiling) Do you need some water?(offering me a bottle of water)
Me : Yes sir...Thank you.
Interviewer : Feeling better now.
Me : Yes sir, thanks again.
Interviewer : Fine...now Pritam ,tell me something about yourself.
Me : Told.(plaese be prepared for this, this is your chance to impress the interviewer at the very beginning of the interview). I gave him my introduction, citing my strong points & I ended my introduction with a question : "Is there anything else you want to know about me sir??"..
Interviewer : No Pritam , That's fine. Do you know binary tree? what is it?
Me : Told.
Interviewer : Good. What is binary search? whats its time complexity?
Me : Told.(I think he liked my answer)
Interviewer : Ok. Do you know about linked lists?
Me :  Yes sir.
Interviewer : Whats the difference between link list and array?
Me : I told about memory allocations..etc..
Interviewer : Write a code for insertion at any position in singly linked list.
Me : Sir, should i write the whole code or just the logic will do?
Interviewer : Ok, explain the logic.
Me : Told.
Interviewer : Do you know DBMS? what is the difference between DBMS and RDBMS?
Me : answered.
Interviewer : What is normalization? Explain the normal forms.
Me : Sir, I cn explain upto BCNF..Idont know 4th n 5th nf very well.
Interviewer : Ok, do it.
Me : I answered with an example. The example I had given was a poor example(I gave a,b,c,d as column names) as I forgot the example I prepared, so be prepared with a real world example.
Interviewer : Fine. Do you know C?
Me : Yes sir.
Interviewer : Write a program to print 
                                             *
                                           *   *
                                         *   *   * 
             height is given by the user.
Me : i quickly did it.
Interviewer : Good. Now can you print     
                                             1
                                            2 3
                                           4 5 6
                   like this?
Me : I did.
Interviewer : What's the similarity between structures and union?
Me : Answered.
Interviewer : Do you know java?
Me :  Yes sir.
Interviewer : What are the types of polymorphism in java?
Me : Itold with examples I prepared from Herbert Schildt..
Interviewer : Ok. Why do you want to join TCS?
Me : I told about the stature of the company, how I can make myself & the company grow in a mutual environment...also told about various awards TCS got, great feedback from my senior who are TCS employee..also told about N Chandrashekharan, who joined TCS as trainee like us & now is the CEO.
Interviewer : (Impressed)Ok Pritam, thats all I need to know.(Smiling) Do you have any question?
Me : Yes Sir. I was going through the TCS website yesterday and the first thing that I saw was Global Network Delivery Model. I am very eager to know what is it?
Interviewer : It's a vast topic pritam. But to be precise...(then he explained the basic idea of GNDM)..
Me : Thank you sir. It's a pleasure to talk with you sir.
Interviewer : Same here Pritam. (Than he willingly brought his hand forward to shake my hand)
Me : Shook his hand with a smile in face.Then again saying thank you, I came out of the room.

My interview went for about 35 minutes.I came out around 4.30 pm. The results were declared at 8 pm...and I was selected. I was like on cloud nine....More so because almost all of my friends were selected. But, some did not get through, I was feeling bad for them. But you never know..a much bigger opportunity may be waiting for them.

So, all aspirants, prepare well, be confidant & never lose hope..just remember one thing : You need not prepare all subjects at once. Prepare those which you are comfortable...& then keep in mind that : "You don't have to remember everything...because no interviewer is smart enough to ask you everything"...

So best of luck to all of you...will meet you at TCS one day....Finally, thank I thank freshersworld for helping me a lot during preparation & giving me the chance to share my experience...I would also thank testfunda.com , m4maths.com & all my friends who helped me in solving the aptitude questions.If you face any problem regarding the solution of apptitude questions or interview preparation...feel free to mail me at pktheking.paul@gmail.com.