National Instruments Campus Selection

NI visited my campus today and the presentation was awesome and when it came to the number of rounds we would go through, he told us we better do not know about it ,as it would get scary. They mentioned that they will be conducting four rounds in our campus followed by the interviews in their bangalore office(They didn't tell the number of rounds they will be conducting there).
1st round-Aptitude-30 min ..60 questions😕😕
2nd round - GD
3rd & 4th round -Technical interview