What is the difference between Group "A" and Group "B" posts in ESE?

Group A posts are superior to Group B posts in ESE, and a Group B officer reports to a Group A officer. CPES (Central Power Engineering Services) group posts: one who joins the post of Assistant Director I or Assistant Executive Engineer (AEE) in the CEA (Central Electricity Authority). They report

Group A posts are superior to Group B posts. A Group B officer reports to a Group A officer. It takes around 4 years to reach Group A post if you have got Group B post through ESE. If one has got a group B post through SSC/RRB/JE exams or any exam like JWM etc. Then it will take 10-15 years to becom