Reasoning and Mental Ability: Draw, Fix and Verify
Core areas
Reasoning tests pattern recognition under time pressure. Revise series (number, alphabet, mixed), analogy, odd-one-out, coding–decoding, blood relations, direction sense, ranking, seating arrangement (linear and circular), syllogism, Venn diagrams, inequalities, dice and cubes, mirror and water images, calendars, clocks, and puzzles. Practise a fixed sequence: identify the rule, apply it, and verify with a second term.
Traps
Direction questions reverse 'left/right' when a person turns around; draw the path rather than doing it mentally. In circular seating, fix one person and note whether facing is 'inside' or 'outside'. In syllogism, do not assume real-world truth; draw minimal Venn diagrams. Calendar problems require odd days, not simple division by 7 without remainders. Clock problems ask for the smaller angle unless stated otherwise.
Rule of thumb
For blood relations, draw a family tree with symbols: + male, − female, horizontal = siblings, vertical = parent–child. For clocks, use angle = |30H − 5.5M| and take the smaller angle.
Worked example
At 3:40, H = 3 and M = 40. Angle = |30×3 − 5.5×40| = |90 − 220| = 130°. Since 130° is less than 180°, the answer is 130°. If the result exceeded 180°, subtract it from 360°.