RRB Group D exam was held on 27 September 2018 (Shift 2) as a computer-based test with 100 multiple-choice questions in subjects like Mathematics, Reasoning, Science, and Current Affairs, all to be completed in 90 minutes with a slight penalty for errors. The selection process also involved additional steps like a Physical Efficiency Test, Document Verification, and a Medical Examination, ensuring candidates are fully qualified for a railway career.