It has questions on Quants ,verbal ability and logical reasoning which had moderate level of difficulty.The other section was purely technical which consisted of core electronics,particularly digital logic design and analog electronics.This section had an easy level of difficulty provided one is well acquainted with these subjects
It was not an elimination round.GD had 10 participants and 3 members in the judging panel.Topic given was general.The score of this round was to be added in the final interview score.
The panel had 2 persons (1 technical and 1 HR).The technical person asked the typical tell me about yourself question and then about extra courses which I had completed.Then he asked me about my favorite subject upon which i mentioned analog electronics and DSP. Thereafter the interview went completely on operational amplifiers and its design and applications.Asked about location constraints. HR at the end asked a single question which was easy to answer.
Throughout this process,they never went through my resume.Instead used a form which was to filled before the interview.Information such as extra courses,favorite subjects,department preference etc had to filled in it.
For aptitude CAT previous year questions and internet is the best source.
For technical section,being thorough with basic concepts is required.
For GD,there must be balance between quantity and quality of speech.Expressing points in a clear and simple manner is the key.
For interview,the key is confidence in whatever you say along with a good proficiency in the subject of one's liking which is in curriculum.