Amit Jain is the Founder & Director of The Core IAS, Delhi. He created the D.E.C.O.D.E. method — a six-step framework that turns a UPSC Mains question into a structured answer. His Mains Answer Writing Workbook 2.0 series puts 480+ real Mains PYQs (2020–2025) through that method, one question at a time.