As you are looking for pattern of WestBengal Public Service Commission Exam, so here I am giving following information:

Pattern of West Bengal Public Service Commission Exam:

Preliminary Exam:
Subjects Marks
General Studies 150 Marks
Arithmetic 50 Marks
Total Marks 200 Marks

Syllabus of Preliminary Exam:

General Studies:
History of India
Current events of national importance
Economic and Social Development Sustainable Development
Poverty
Social Sector initiatives
General issues on Environmental Ecology
Current events of international importance
Indian and World Geography
Bio-diversity
Inclusion, Demographics
General Science
Indian National Movement
Indian Polity and Governance
Climate Change, etc.

Arithmetics :
Boats and Streams
Stocks and Shares
True Discount
Time and Distance
Compound Interest
Partnership
Area
Permutation and Combination
Decimal Fraction
Square Root and Cube Root
Pipes and Cistern
Logarithm
Time and Work
Problems on Ages
Odd Man Out and Series
Problems on Numbers
Ratio and Proportion
Allegation or Mixture
Races and Games
Probability
Percentage.etc.

English:
Translation from Bengali/Hindi/Urdu/Nepali/Santhali to English
Use of common phrases
Condensing of a prose passage
Correction of sentences
Synonyms and Antonyms
Correct Use of Words
Drafting of a report from points or materials supplied, etc.

Bengali/Hindi/Urdu/Nepali/Santhali :
Translation from English to Bengali/Hindi/Urdu/Nepali/Santhali
Grammar from 12th standard
Condensing of a prose passage, etc.