SSC CHSL Tier 1 is the first stage of the selection process, a 60-minute computer-based test (CBT) with 100 multiple-choice questions (MCQs) that assess candidates in four subjects: General Intelligence, General Awareness, Quantitative Aptitude, and English Language. The exam has a total of 200 marks, with 2 marks for each correct answer and a deduction of 0.5 marks for each incorrect answer. While it is a qualifying round for the next stage, the marks are not considered for the final merit list, which is based on Tier 2 performance.