As you want to know Tamilnad mercantile bank clerk exam pattern/syllabus, so on your demand here I am providing same for you :

Quantitative Ability

Number System.
Percentages.
Decimal & Fractions.
Profit and Loss.
Simplification.
Problems on Ages.
Time and Work.
Average.
Ratio and Proportions.
Time and Distance.
HCF & LCM.
Mixtures & Allegations.
Simple & Compound Interest.
Data Interpretation etc.

Reasoning

Number Series.
Coding-Decoding.
Non-Verbal Series.
Analogy.
Alphabet Series.
Decision Making.
Number Ranking.
Clocks & Calendars.
Directions.
Cubes and Dice.
Arithmetical Reasoning.
Blood Relations.
Mirror Images.
Embedded Figures etc.

General English

Verb.
Error Correction.
Subject-Verb Agreement.
Articles.
Tenses.
Fill in the Blanks.
Adverb.
Vocabulary.
Sentence Rearrangement.
Unseen Passages.
Comprehension.
Grammar.
Idioms & Phrases.
Synonyms.
Antonyms etc.

General Awareness

Current Affairs – National & International.
Budget and Five Year Plans.
Awards and Honours.
Important Financial & Economic News.
Abbreviations.
Important Days.
Science – Inventions & Discoveries.
Sports & Awards.
International & National Organizations.
Books and Authors.
Countries & Capitals etc.