it was an offcampus drive i attended in july 15, overall 1000+ participated,although dint got selected sharing my experience
frstly apti,verbal,english and sql rounds are conducted within 1hr30mts time
qstns hugely asked from piecharts profit loss ages calendars percentages etc just be prepared guys nd if u clear frst round 97% ur chances of getting job is done bcoz next round is hacathon group round u have to creat a flow chart nd tell them nd tech round basic qstns on ur resume ,last round hr basic persnl qstns
so clr frst round guys

In syntel aptitude test
90 minutes
Three parts
quant , english , LR
30 min 30 ques in each parts
In quant there is a mixed bag of topics like profit and loss, mensuration, compound interest , time and work.. Speed matters a lot..
level of english was good mostly reading passage was there..
LR section was easy.

1ST round was GD....70% students were selected d rejection ratio in this round was too less....u just need to speak and no one is going to give u a chance to speak so u have to grab that chance and if someone interupts u once u started speaking tell him or her politely dat "pls let me complete first " dis is what exactly i did.so in GD u just need to speak evn if u dnt knw wat exactly u are speaking.
then comes the technical where i was rejected :
he asked me puzzles which was so unexpected....puzzles like if u have 4 tablets in which 2 tablets are of 1 kind and other two are of some different kind and the doctor has asked you to take two tablets from each from both type in d morning and the other two in the evening then how will u take them when their color,shape,size,weight everything is same.
and other puzzle was there is a pond and it has 1 flower on the 1st day,2 flowers on the second day and 4 flowers on the 3rd day and the whole pond got filled on the 20th day then on which day it will be half....
these kinds of puzzles were their which i faced and got rejected.
so be prepare for the unexpected in an interview.