RajeshKaushal 3
Both exams have a separate syllabus, method, and question paper. Many of my friends failed Tier 1 of the CGL while studying for Civil Services.
CGL is usually cleared first, followed by CSE. Those who are 100 percent certain should take CSE.
Civil service hopefuls, in fact, anyone, can pass CGL, but only if they prepare for it. If you believe that studying for CSE will help you pass CGL, you are mistaken.