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Hello,

First of there are three groups of jobs available through Civil Service Exam which are All India Civil Services, Group A Services which are central services and Group B Services which are state services, now the services under these three are mentioned as follows;

All India Civil Service : Indian Administrative Service (IAS).Indian Police Service (IPS) and Indian Foreign Service (IFS)

Group ‘A’ Civil Services : Indian P & T Accounts & Finance Service, Indian Audit and Accounts Service, Indian Revenue Service (Customs and Central Excise), Indian Defence Accounts Service, Indian Revenue Service (I.T.) or IRS, Indian Ordnance Factories Service (Assistant Works Manager, Administration), Indian Postal Service, Indian Civil Accounts Service, Indian Railway Traffic Service, Indian Railway Accounts Service, Indian Railway Personnel Service, Indian Railway Protection Force (Assistant Security Commissioner)Indian Defence Estates Service, Indian Information Service (Junior Grade), Indian Trade Service, Group 'A' (Gr. III), Indian Corporate Law Service

Group ‘B’ Civil Services : Armed Forces Headquarters Civil Service (Section Officer's Grade), Delhi, Andaman & Nicobar Islands, Lakshadweep, Daman & Diu, and Dadra & Nagar Haveli Civil Service (DANICS), Delhi, Andaman & Nicobar Islands, Lakshadweep, Daman & Diu, and Dadra & Nagar Haveli Police Service, Pondicherry Civil Service, Pondicherry Police Service

So, there are three services in All India Civil Services, 16 services in Group A which are central services as mentioned earlier and Group B which is state service has five services, so in total there are 24 services for which recruitment is done through Union Public Service Commission Civil Service Examination.