Reasoning, Logic & Computer Knowledge
BODMAS Order — Brackets, Orders (powers/roots), Division, Multiplication, Addition, Subtraction. Remember: Big Oranges Don't Make Any Sense. Apply left-to-right for equal-priority operations (DM or AS).
Clock Angle Formula — Angle between hands = |11M - 60H|/2 degrees, where H=hour, M=minutes. At 3:15, |11(15) - 60(3)|/2 = 7.5°. Saves calculation time.
Direction Sense: NESW Circle — Clockwise: Never Eat Sour Watermelon. Right turn = next letter clockwise; left turn = anticlockwise. 90° right from North = East.
Blood Relations: Generation Levels — Map vertically: Grandparent (top), Parent, Self, Child, Grandchild (bottom). Sideways = siblings/cousins. Mother's brother = Uncle. Father's sister = Aunt. Visualize family tree instantly.
Divisibility by 11 — Alternating digit sum: subtract odd-position digits from even-position. If result is 0 or multiple of 11, divisible. Example: 2728 → (7+8)-(2+2)=11, divisible.
Mirror Image Rule — Left↔Right swap only; top-bottom unchanged. Letters with vertical symmetry (A, H, I, M, O, T, U, V, W, X, Y) look same. Asymmetric letters reverse: b↔d, p↔q.
Calendar: Odd Days Method — Ordinary year=1 odd day, leap year=2. Century: 400-multiple=0, else check. Month code: Jan=0, Feb=3, Mar=3, Apr=6, May=1, Jun=4, Jul=6, Aug=2, Sep=5, Oct=0, Nov=3, Dec=5.
IP Address Classes (A-E) — Apple (1-126, /8), Banana (128-191, /16), Cherry (192-223, /24), Dates (224-239, multicast), Experimental (240-255). First octet determines class instantly.
General Knowledge, Social Studies & Current Affairs
Indian Freedom Struggle Timeline — 1857 (Revolt), 1885 (Congress), 1905 (Bengal Partition), 1919 (Jallianwala), 1930 (Salt March), 1942 (Quit India), 1947 (Independence). LEAP years anchor events: '57-'85-'05-'19-'30-'42-'47.
Indian Constitution Parts — 8 Parts: 1-States, 2-Citizenship, 3-Fundamental Rights, 4-DPSP, 5-Union, 6-States, 7-First Schedule Areas, 8-Union Territories. 12 Schedules recently added (originally 8).
Latitude Tricks — Tropic of Cancer: 23.5°N (passes through 8 Indian states: Gujarat, Rajasthan, MP, Chhattisgarh, harkhand, B, ripura, izoram — ). Equator=0°, Poles=90°.