What this booklet covers Use this seven-page field guide for a focused SSC CGL Quantitative Aptitude revision session. It explains percentage conversions and successive change, ratio and proportion, profit-loss, markup and discount through calculation-first methods. Each chapter highlights the base quantity, shows a worked method, and calls out common exam traps. Practice and verification The final section contains a timed 15-question drill followed by a checked answer key. Attempt the questions without looking at the key, review every mistake by concept, and revisit the linked SSC CGL Arithmetic Mastery course for full lessons and additional practice. Source note The exam context is aligned to the official Staff Selection Commission Combined Graduate Level Examination 2026 notice. The booklet does not invent dates, vacancies, cut-offs, or eligibility claims.