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The syllabus for tests for various posts and sections is basically common with slight changes in topics relevant to each post and section.
The general syllabus for RRB tests is as follows:

• Quantitative Aptitude
  Topics:
  Numbers, H.C.F and L.C.M of Numbers, Decimal Fractions, Simplification, Square Roots & Cube Roots, Average,
  Problems on Numbers, Problems on Ages, Surds & indices, Percentage, Profit and Loss, Ratio & Proportion,
  Partnership, Chain Rule, Time and work, Pipes & Cistern, Time and Distance, Problems on Trains,
  Boats & Streams,? Alligation or Mixture, Simple Interest, Compound Interest, Logarithms, Area,
  Volume & Surface Areas, Races & Games of Skill, Calendar, Clocks, Permutations and Combinations, Probability,
  True Discount, Bankers Discount, Heights & Distances, Odd Man Out & Series
• General Knowledge
  Topics:
  Awards, Personalities, Books and Authors, Places, India and The World, Government Programmes,
  Committees and Commissions, Organisations, Dates, Abbreviations, Sports, Language and Culture,
  Computer, Environmental Studies, Miscellaneous, Current Affairs, Indian History, Geography,
  Indian Economy, Indian Polity, General Science
• Verbal Reasoning
  Topics:
  Series Completion, Analogy, Classification, Coding-Decoding, Blood Relations, Puzzle test,
  Sequential Output tracing, Direction Sense Test, Logical Venn Diagrams, Alphabet Test, Alpha - Numeric Sequence Puzzle, Number,
  Ranking and Time Sequence Test, Mathematical Operations, Logical Sequence of Words, Arithmetical Reasoning, Inserting the Missing Character, Data Sufficiency,
  Eligibility Test, Situation Reaction Test, Verification of Truth of the Statement
• Non-Verbal Reasoning
  Topics:
  Series, Analogy, Classification, Analytical Reasoning, Mirror Images, Water Images,
  Embedded Figures, Completion of Incomplete Pattern, Figure Matrix, Paper Folding, Paper Cutting, Rule Detection,
  Grouping of Identical Figures, Cubes and Dice, Dot Situation, Construction of Squares & Triangles, Figure Formation & Analysis
• Physics
  Topics:
  Mechanics, General Properties of Matter, Waves, Heat, Optics, Electricity and Magnetism, Modern Physics
• Chemistry
  Topics:
  States of Matter, Atomic Structure, Radioactivity, Chemical Bonding, Solutions and Surface Chemistry, Chemical Kinetics Catalysis Physical and Chemical Change,
  Thermochemistry, Electrochemistry, Periodic Classification of Elements, Metals and Their Compounds, Non-Metals and Their Compounds, Hydrocarbon and Its Derivatives,
  Acids Bases Salts and Redox Reactions, Biomolecules, Chemistry in Everyday life
• Biology
  Topics:
  Biology and Its Branches, Cell Biology, Tissue System, Evolution, The Living World and Pathology, Plant and Animal Physiology,
  Taxonomy and Morphology of Plant, Genetics, Economic Botany, Agriculture and Animal Husbandry