DATA INTERPRETATION (major focus in Mains):
  Types: table, bar graph, pie chart, line graph, mixed/caselet
  
  TABLE DI:
    Read all values carefully before attempting
    Calculations: percentage, ratio, average, growth rate
    Time saver: approximate to nearest 5 for elimination
  
  CASELET DI:
    Paragraph with embedded data — extract and organise first
    Draw table from text before solving
    Common: work distribution, investment, population data
  
  SPEED CALCULATION:
    Squares up to 50, cubes up to 20
    Tables up to 20
    Fractions: 1/7=14.28%, 1/8=12.5%, 1/9=11.11%, 1/11=9.09%

SERIES (number + missing):
  Wrong number series: find the odd one out
  Patterns: ×2, ×3, ×0.5, +prime numbers, +odd squares
  Alternating series: two interleaved patterns

QUADRATIC EQUATIONS:
  Relationship between roots and coefficients
  Sum of roots = -b/a | Product of roots = c/a
  Compare two equations: find if x > y or x < y or x = y

PERMUTATION AND COMBINATION:
  nPr = n!/(n-r)! | nCr = n!/[r!(n-r)!]
  Circular permutation: (n-1)!
  Banking typical: password formation, team selection, seating

PUZZLE TYPES (most important for Mains):
  Linear seating: 8 people in a row, face north/south
  Circular seating: 8 people, face centre/outward
  Floor puzzle: 7 floors, people on specific floors
  Box puzzle: boxes stacked, coloured, contain items
  Month/Day puzzle: birthdays, events in months
  Double decker: two rows facing each other
  
  APPROACH:
    1. Note fixed positions first (A is at extreme left)
    2. Note relative positions (B is 3rd to right of A)
    3. Note facing information separately
    4. Fill tentatively and verify all conditions

BLOOD RELATION + DIRECTION COMBINATION:
  Modern trend: combine two topics in one question
  Draw family tree + compass diagram simultaneously

CODING (new patterns):
  Row-based coding: conditions based on position in a row
  Sentence coding: each word coded by a number
  Symbol coding: letters to symbols with a pattern

MONETARY POLICY TOOLS:
  CRR (Cash Reserve Ratio): % of deposits banks keep with RBI (cash)
    Current: 4.5% | Higher CRR = less money to lend = tight policy
  SLR (Statutory Liquidity Ratio): % in govt securities
    Current: 18% | Higher SLR = less money to lend
  Repo Rate: rate at which banks borrow from RBI
    Current: ~6.5% | Higher repo = costlier loans = less borrowing
  Reverse Repo: rate at which RBI borrows from banks
    Usually 25 bps below repo rate
  MSF (Marginal Standing Facility): emergency borrowing above repo
    25 bps above repo rate

BANKING ACTS:
  RBI Act 1934: establishment and powers of RBI
  Banking Regulation Act 1949: governs banks, licensing, inspection
  SARFAESI Act 2002: allows banks to recover NPA without court
  IBC (Insolvency and Bankruptcy Code) 2016: resolve insolvencies
  PMLA (Prevention of Money Laundering) 2002: AML framework

NPA CLASSIFICATION:
  Standard Asset: regular payment
  Sub-Standard Asset: NPA for less than 12 months
  Doubtful Asset: NPA for 12+ months
  Loss Asset: uncollectible, fully provisioned
  
  Gross NPA = all NPA before provision
  Net NPA = Gross NPA - provisions made