general topics were given however you should be ready with any of those bullets to fire in them they are simply checking your confidence and the way you are able to make others convince by your views and don't forget the basics that is ENGLISH

50%

anything from your branch and c,c++ is a must to be prepared with before going to this interview

they simply make u cosy and make u familiar with their envoronment and then they ask some personal questions such as how are u feeling now, any quality of yours of which your friends are a fan of,any bad quality which you feel you must quit etc.

DO-
1. make sure you are prepared enough to answer each and every question thrown upon u
2. if u don't know a answer of any question interviewer asks to you straight away say i don no sir but then at the same time draw him towards your subject by your talks
3. be confident
4. make your resume as concise as possible and don't add any extra subject which you don't know
5. make yourself thorough with a good english speaking skills

DON'Ts
1. don't show them any kind of attitude
2. avoid fillers when you are forgetting something think before you speak
3. don't let him go off your subjects
4. don't boast about any of your qualities

from my college approiamately 200 students applied of which only 65 got selected in written and 56 turned out at the timt of interview it was a pool interview session so students from other colleges where also present there maximum eliminations were done in the technical interview and from my colleges 14 got finally selected and i am happy that i am among those lucky chosen ones