My first experience with siemens paper

Well i am a computer science student and as i m presently facing the placement season, So i thought of keeping my views in front of all. Correct me wherever i go wrong. As this is the first time that i appeared for a test at siemens information limited(SISL) under shreds,Kerala.
The scheduled time was 8 a.m. on 10th Feb. '08. It started at 8:30 a.m. I was in the first batch i.a A(totally there was 4 batches). The criteria was 64.5% throughout the B.tech only or questions on C/C++.
A total of 3000 students appeared for it.
The first round was Quantitative aptitude test consisting of 60 questions under 45 minutes. cut-off was rather high, i guess i managed to survive although i didn't practice this section before, so my luck served me this time.
Hardly 600 students were selected for the next round,and the second round was on either C or C++. i choose C, consisting of 15 questions withing 15 minutes. Questions were bit experimental so can be considered as tough, thats y cut-off was near about 4 or 5. After this only 300 students got selected for the next round which was now the siemens own paper.
As i was selected for this round also was expecting to have questions from O.S. ,networking,UNIX but unfortunately the questions were based only on C,C++ and quantitative aptitude. 19 questions from C++,6 questions from C and 25 questions from aptitude(was easy). As C++ is not a part of our syllabus so had to leave all the questions pertaining to the same, although tried to attempt few questions by asking Lawlesh my batch mate ,who was sitting just behind me but could not succeed in surviving for the interview round.
i thought i would be selected but the criteria was something different as per the observation,they selected the persons(63) for interview round who did not have the minimum cut-off and high percentage of marks so i had only 68% might be the reason for my elimination.
Among them 3 candidates from my college got selected in siemens, after 2 round of interview. one was Nilesh from IT and 2 from E.C (Rachna and aishwarya i guess).
so, knowledge, luck and confidence were there which brought me till the entry level, as i had luck but no knowledge (C++). confidence, but had no opportunity to show :) Above all the experience i gained was worth all the trouble... :-)