General Studies
DAPERMI for Disaster Types — Natural disasters: Drought, Avalanche, Pandemic, Earthquake, Riverflood, Meteor, Inundation. Helps recall major disaster categories for Disaster Management questions.
Budget Components REDC — Union/State Budget has four key parts: Revenue receipts, Expenditure (revenue + capital), Deficit indicators, Capital receipts. Quick checklist for budget analysis questions.
Five-Year Plan Memory: 1-2-3-4-5 — 1st Plan (1951) = Agriculture, 2nd = Industry, 3rd = Self-reliance, 4th = Stability, 5th = Poverty removal. Each number loosely maps to priority shift in Indian planning.
Mitigation vs Response Clock Rule — Before 12 o'clock = Mitigation (early warning, building codes, drills); After 12 = Response (rescue, relief, rehabilitation). Time-based split for disaster management phases.
Mental Ability and Reasoning
BODMAS Trap Check — Always check if Division comes before Multiplication in left-to-right scan; many aspirants auto-apply M before D and lose marks. Write D-M-A-S on rough paper first.
Syllogism Venn Circles — Draw two overlapping circles for "Some A are B"; completely contained circle for "All A are B"; separate circles for "No A are B." Visual method prevents conclusion errors.
Data Sufficiency: AD-BCE Rule — If Statement I alone works = A; Statement II alone = D; Both together needed = C; Either alone = B; Neither sufficient = E. Memorize this AD-BCE order to match answer codes.
Coding Pattern: +13 Caesar — For alphabet-shift codes, +13 (half-alphabet) is most common. A↔N, B↔O... Quick mental check: if code looks random, try ±13 first before complex patterns.
Series Missing Term: Odd-Even Split — When number series seems irregular, separate odd-position and even-position terms. Often two independent simple progressions (like +2 and ×2) running parallel.
Clock Angle Formula — Angle between hands = |30H − 5.5M| degrees, where H = hour, M = minutes. For "11:10", |30×11 − 5.5×10| = 275° (or 85° acute).
Quantitative Aptitude
Divisibility by 11 Trick — Alternate digit sum difference: 7359 → (7+5)−(3+9)=0, divisible by 11. For quick factorization and HCF/LCM problems in Number Systems.
SI-CI Difference Shortcut — For 2 years: CI−SI = P(r/100)². For 3 years: CI−SI = P(r/100)²(3 + r/100). Saves 20-30 seconds per compound interest question.
Percentage-Fraction Bridges — Memorize: 12.5%=1/8, 16.66%=1/6, 33.33%=1/3, 37.5%=3/8, 62.5%=5/8, 87.5%=7/8. Instant conversion speeds up Profit-Loss and Ratio calculations.
Quadratic Sum-Product — For x²+bx+c=0, sum of roots = −b, product = c. If roots are 3 and 5, equation is x²−8x+15=0. Reverse-engineer equations in 5 seconds.
Arithmetic Progression nth Term — aₙ = a+(n−1)d. For sum: Sₙ = n/2[2a+(n−1)d]. Write "n/2 twice" on paper—once for term formula, once for sum—prevents formula confusion.
Mensuration Volume Cube Rule — Volume formulas: Cube=a³, Cuboid=lbh, Cylinder=πr²h, Cone=⅓πr²h, Sphere=⁴⁄₃πr³. Mnemonic: "C-C-C-C-S" order; cone/pyramid always ⅓ of corresponding prism.
Coordinate Geometry Distance — Distance = √[(x₂−x₁)²+(y₂−y₁)²]. Midpoint = ((x₁+x₂)/2, (y₁+y₂)/2). Write "square differences, then root" to avoid sign errors in negative coordinates.
Probability Basic Fraction — P(Event) = Favorable outcomes / Total outcomes. For "at least one" problems, use 1 − P(none). Saves time versus calculating multiple event combinations.
English Language
FANBOYS for Conjunctions — Coordinating conjunctions: For, And, Nor, But, Or, Yet, So. Use comma before FANBOYS when joining two independent clauses (subject+verb both sides).
Subject-Verb Agreement: Ignore Middle — Cross out prepositional phrases between subject-verb. "The box of pencils is (not are) here." The true subject is "box" (singular), not "pencils."
Active-Passive Tense Shift — Active: S+V+O. Passive: O + is/was/been + V₃ + by S. Remember tense carrier moves: "wrote" (active) → "was written" (passive). V₃ stays constant.
Cloze Test: Read Full Paragraph First — Spend 30 seconds reading entire passage before filling blanks. Context clues often appear 1-2 sentences after the blank, not before. Reduces error rate by 40%.
Para Jumble: Find the Opener — Opening sentence has no pronoun reference (no "this/that/he/she" without antecedent) and introduces topic broadly. Mark potential openers, then sequence remaining logically.