As you have asked about the syllabus to become an clerk, I am providing that here

Quantitative Aptitude :

Number system
Simplifications
Roots & Averages
Surds & Indices
Percentages
Profit&Loss
Ratio& Proportion
Partner ship
Chain rule
Time & work
Pipes & Cisterns
Time & Distances
Problems on trains Boats & streams Allegation & mixtures Simple Interest
Compound interest Stocks&Shares clocks&algorithms mensuration
Volume& surface area permutations& combinations heights& distances
Data Integration :
line graphs
bar graphs
pie charts
Tabulation

Reasoning Ability :
Verbal reasoning:
Analogy
Coding & decoding
Blood relations
Sitting arrangements
Series completion
syllogisms
Decision making
Statement reasoning
Non-verbal reasoning :
Analogy Series completion Classification
General English :
Vocabulary
synonyms
Antonyms
Word formation
Sentence completion

Comprehension
Theme detection
Deriving conclusions
Passage completion
Error detection
Passage correction
Sentence correction

General Awareness:
Knowledge of current events
Sports , history, geography, culture,Indian constitutions
News about technology and researches
News on India and its neighboring countries

Computer Awareness :
Computer hardware
operating system concepts Shortcut keys ms word, excel
ms power point, access internet & networks Basic security concepts Latest technologies