CSG Software Development Engineer interview questions

Csg came for campus recruitment.they called to office . There were four rounds. First round was written test in that asked questions on important computer science subjects like D's,dbms,os, array ,pointer etc ..30 people were given test 13 were shortlisted for the technical interview . In first technical they asked to explain the question which we solved in first round ..and the second technical they asked datastrucre program,sql queries,some questions on angular J's ,binary search tree and the fourth round was hr round they asked some formal questions ..3 out of 14 got selected at the end.