General Intelligence and Reasoning
BODMAS Order — Brackets, Orders (powers/roots), Division, Multiplication, Addition, Subtraction. Always solve in this sequence to avoid arithmetic reasoning errors in complex expressions.
Coding Left-Right Shift — For alphabet coding, remember A=1, Z=26. If coded as +3 shift: CAT → FDW (C+3=F, A+3=D, T+3=W). Practice fixed shifts of ±3, ±5 for speed.
Direction Anti-Clockwise NESW — North→West→South→East (anti-clockwise). Left turns go anti-clockwise, right turns go clockwise. Draw quick compass rose for complex multi-turn problems.
Blood Relations Key — Mother's/Father's brother = Uncle; Sister's/Brother's son = Nephew; Sister's/Brother's daughter = Niece. Son's wife = Daughter-in-law. Maternal/Paternal distinguishes sides.
Series Jump Pattern — In number series, check: +prime numbers (2,3,5,7...), perfect squares (1,4,9,16...), or alternating operations. Write difference below each term to spot patterns instantly.
Syllogism: Some + No = Some Not — If "Some A are B" and "No B is C," then "Some A are not C" is valid. All+All combines, No+All gives No, Some weakens conclusions.
General Knowledge and General Awareness
VIBGYOR for Rainbow — Violet, Indigo, Blue, Green, Yellow, Orange, Red. Wavelength increases; frequency decreases from V to R. Essential for optics and light questions.
Directive Principles: GELS — Gandhian (Article 48-51: cow protection, village panchayat), Economic (38-39: minimize inequality, welfare), Liberal (41-47: education, work, justice), Socialistic (39A-43A: equal justice, free legal aid).
1857 Revolt Centers: LIMD — Lucknow (Begum Hazrat Mahal), Kanpur (Nana Sahib), Meerut (Mangal Pandey), Delhi (Bahadur Shah Zafar). Remember leaders with their centers for quick recall.
Vitamin Deficiency ABCDE — A=Night blindness, B₁=Beri-beri, C=Scurvy, D=Rickets, E=Sterility. Water-soluble: B-complex and C; Fat-soluble: A, D, E, K.
Presidents Chronology: RRZVG — Rajendra Prasad, Radhakrishnan, Zakir Husain, V.V. Giri, Fakhruddin Ali Ahmed (first five). Link initials with tenure order 1950-77 for history questions.
Latitude-Longitude Trick — Lat=Ladder (vertical, measures North-South, Equator=0°). Long=Rungs (horizontal, East-West, Prime Meridian=0°). India spans 8°4'N to 37°6'N latitude.
Elementary Mathematics
Divisibility by 11 — Subtract sum of alternate digits: 2728 → (2+2)-(7+8)= -11, divisible by 11. If difference is 0 or multiple of 11, number is divisible.
Percentage-Fraction Equivalents — 12.5%=⅛, 16.67%=⅙, 20%=⅕, 25%=¼, 33.33%=⅓, 50%=½, 66.67%=⅔. Memorize these to convert instantly and solve faster without calculator.
SI & CI First Year Same — Simple Interest and Compound Interest are identical for one year only. For 2 years, CI extra = P(R/100)². Use this shortcut for comparison problems.
Speed-Distance-Time Triangle — Cover S in triangle: D on top, S×T at bottom. D=S×T, S=D/T, T=D/S. Hand-cover method works for quick formula recall during exam.
Profit % Formula Shortcut — If CP=100, SP=120 → 20% profit. If CP=80, SP=100 → (20/80)×100=25% profit. Always convert CP to base for percentage calculation.
Compound Ratio Multiplication — Ratio of 2:3 compounded with 4:5 = (2×4):(3×5) = 8:15. Multiply numerators together, denominators together. Essential for complex ratio problems.
Time-Work: M₁D₁W₂ = M₂D₂W₁ — Men×Days×Work are inversely proportional. If 10 men finish work in 6 days, 15 men finish in (10×6)/15=4 days. Apply cross-multiplication directly.
Mensuration: Circle 2πr, 4πr² — Circumference=2πr (linear, so 2 appears), Area=πr² (square unit). For sphere: Surface=4πr², Volume=4/3πr³. Remember 4/3 for sphere volume only.
English / Hindi
Its vs It's Rule — "Its" shows possession (The dog wagged its tail). "It's" means "it is" (It's raining). Apostrophe = contraction, no apostrophe = possessive pronoun.
Subject-Verb Agreement — Singular subjects (each, every, everyone, nobody) take singular verbs: "Everyone is present." Plural subjects take plural verbs: "The students are present."
Sandhi Trick for Hindi — स्वर+स्वर = दीर्घ (अ+अ=आ); गुण (अ+इ=ए); व्यंजन (त्+च=च्च). Remember महा+आत्मा=महात्मा, देव+इंद्र=देवेंद्र for competitive patterns.
Common Idioms: Animal Theme — "Crocodile tears"=fake sympathy, "Red herring"=distraction, "White elephant"=costly burden, "Dark horse"=surprise winner. Animals make idioms memorable for quick elimination.
Muhavare: Aag/Paani — आग में घी डालना (aggravate), आग लगाना (instigate), पानी-पानी होना (ashamed), पानी में आग लगाना (impossible task). Fire/water idioms appear frequently in SSC.
Paryayvachi Clusters — सूर्य: रवि, दिनकर, भास्कर, आदित्य | जल: नीर, पानी, तोय, अंबु | पृथ्वी: धरा, वसुधा, धरित्री, भू. Group synonyms by common nouns for faster recall.