the aptitude round is pretty tricky.. probably level of aptitude is higher when compared to other companies along its lines.. it is then followed by technical and then hr round... tis is quite easily actually.. jus be thorough with C-programming.. just the basics would be sufficient...
Interview questions [1]
Question 1
for a mechanical, civil, aero and iem students hav an answer ready for this question before hand.... "Being a mechanical engineer why do you want to get into software field/ tcs..."