In competitive exams like SSC, Banks, IBPS Railways and State Government exams Key Investigative wings & Central Agencies are very important to score good marks.
| CAPF | Central Armed Police Forces |
| CBI | Central Bureau of Investigation |
| CB-CID | Crime Branch Crime Investigation Department |
| CCTNS | Crime and Criminal Tracking Network & Systems |
| CID | Crime Investigation Department |
| SCRB | State Crime Records Bureau |
| NCRB | National Crime Records Bureau |
| NIA | National Investigation Agency |
| IB | Intelligence Bureau |
| R&AW / RAW | Research and Analysis Wing |
