RRB Group D exam on 23 Sept 2018 (Shift 1) was a computer-based test with 100 multiple-choice questions covering subjects like Math, General Intelligence, Science, and Current Affairs. Candidates had 90 minutes to complete it with a penalty for wrong answers. The selection process included additional stages like a Physical Efficiency Test, Document Verification, and Medical Exam, ensuring the right candidates meet both academic and health standards for railway jobs.