# Aptitude
All Aptitude notes →Data Interpretation
Reading tables, bar/line/pie charts, and caselets accurately under time pressure.
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Number Systems, HCF & LCM
Divisibility rules, remainders, factors, and LCM/HCF shortcuts for speed-solving.
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Percentages, Profit-Loss & Interest
Percentage-change chains, discount and markup, and simple vs. compound interest problems.
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Permutations, Combinations & Probability
Counting principles, arrangement vs. selection, and basic probability for exam-speed solving.
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Ratios, Averages & Mixtures
Ratio-proportion reasoning, weighted averages, and alligation/mixture problems.
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Time-Speed-Distance & Time-Work
Relative speed, trains and boats-streams problems, and work-rate combination problems.
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