IES Syllabus: IES Preliminary & Main Syllabus 2021 Main Syllabus The Engineering Services examination consists of three stages: Preliminary, Main, Personality test. In the Preliminary exam there will be two papers carrying a maximum of 500 marks: Paper-I will be of General Studies and Engineering Aptitude. Paper-II will be of Civil/Mechanical/Electrical & Electronics and Telecommunication engineering. The Engineering Services (Main/stage-II) Examination will consist of two conventional type papers in Engineering Discipline specific with a duration of three hours and maximum marks of 600 (300 Marks in each paper). The General Studies and Engineering Aptitude for Preliminary Examination/Stage-I, Paper I, Objective type, is common to all Candidates. The exam comprehends of subjects current affairs, Engineering along with logical reasoning and analytical ability, mathematics, numerical analysis, general principals of design, drawing, the importance of safety.