As you want to know details of Indian Statistical Service Examination, here I will help you and will also let you know eligibility criteria.

Eligibility
Nationality
A candidate must be either (a) a Citizen of India, (b) a subject of Nepal, (c) a subject of Bhutan, (d) a Tibetan refugee

Age
A candidate for admission to this exam must have attained the age of minimum 21 years and must not have attained the age of maximum 30 years

Eligibility
A candidate for the Indian Statistical Service must have obtained a Bachelor's Degree with Statistics/Mathematical Statistics/Applied Statistics as one of the subject or a Master's degree in Statistics/Mathematical Statistics/Applied Statistics from a university.

Application fee
Candidates (excepting Female/SC/ST/PH candidates who are exempted from payment of fee) are required to pay a fee of Rs.200/- either by depositing the money in any Branch of SBI by Cash or by using Net Banking facility of SBI

Exam pattern
The exam consists of 6 Papers.
Duration of each paper is 3 Hours except for Paper III & IV.
Duration of Paper III & IV is 2 Hours each.
Paper I & II are conducted for 100 marks each.
Paper III & IV are of Objective type i.e it consists of Multiple Choice Questions.
Papers III, IV, V, VI are conducted for 200 Marks each.
Paper I & II consists of General English & General Studies respectively.
Paper III to VI consists of Professional Knowledge i.e Statistics Subjects.
All the papers must be answered in English Langauge only.
Candidates who get qualified in the Written test will be called for Viva-Voce.

Exam Subject Marks Duration
Written Test General English 100 3 Hours
General Studies 100 3 Hours
Statistics-I (Objective) 200 2 Hours
Statistics-II (Objective) 200 2 Hours
Statistics-III (Subjective) 200 3 Hours
Statistics-IV (Subjective) 200 3 Hours
Total 1000
Viva – Voce 200


Syllabus
General Studies
Current Events -National & International.
Indian Geography.
Indian History.
Indian Polity.
Indian Constitution.
Polity & Governance.
Environmental Studies.
Science & Technology etc.

General English
Passages.
Precise Writing.
Essays.
Comprehension.
Antonyms.
Synonyms.
Letter Writing etc.

Statistics-I
Probability.
Statistical Methods.
Numerical Analysis.
Computer Application.
Data Processing etc.

Statistics-II
Linear Models.
Statistical Inference.
Hypothesis Testing.
Official Statistics.
Sector Wise Statistics.
Population Census.
Socio-Economic Indicators etc.

Statistics-III
Sampling Techniques.
Estimation of Population.
Econometrics.
Applied Statistics.
Time Series Analysis.
Fourier Transform etc.

Statistics-IV
Operations Research and Reliability.
Branch and Bound Method.
PERT and CPM.
Exponential Distributions.
Demography and Vital Statistics.
Survival Analysis and Clinical Trial.
Data Management.
Quality Control.
Multivariate Analysis.
Design and Analysis of Experiments.
Computing with C and R etc.