RRB Group D exam held on 25 September 2018 (Shift 1) followed the Computer-Based Test (CBT) format, featuring 100 multiple-choice questions from Mathematics, General Intelligence & Reasoning, General Science, and General Awareness & Current Affairs. The exam had a 90-minute duration, with a negative marking of 0.33 marks for each incorrect response. The selection process includes multiple stages: CBT, Physical Efficiency Test (PET), Document Verification, and Medical Examination, ensuring that only candidates meeting the required physical and medical standards qualify for railway job roles.