Reasoning & Quantitative Aptitude

Syllabus head (iii) — Reasoning ability and Quantitative Aptitude | Chapter 12 of 18

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Why this chapter matters

The 2022 CRT paper for Vice Principal (Directorate of Education, GNCTD) carried 120 questions for 300 marks — 2.5 marks per question, with one-third negative marking. Around 20 questions (about 50 marks) came from this syllabus head. That is more weight than most single education-theory chapters in this book.

Two features of these 20 questions matter for your strategy:

• Almost every question was dressed in school data — marks of sections, attendance percentages, division of a PTA fund, ages of a teacher and a student, invigilation duty, seating of teachers in a meeting. The mathematics underneath is Class 8–10 arithmetic and standard reasoning; only the costume is administrative.
• The difficulty is deliberately moderate. The paper-setter separates candidates using traps (wrong base for a percentage, forgetting that a transferred student changes both sections, left/right confusion in seating), not using hard mathematics. This chapter therefore teaches the trap alongside every method.

Score arithmetic: getting 16 of these 20 right adds about 40 marks; careless errors on 6 of them can swing your total by over 20 marks once negative marking is counted. No other 20 questions in the paper are this controllable.

What this chapter covers

• PREREQUISITES
• THE COMPLETE METHOD TOOLKIT (TOPICS A TO Q)
• THE EXAMINER'S ANGLE
• COMMON ERRORS THAT COST MARKS
• COMPRESSED REVISION SHEET

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