Operator substitution
Whole chapter · 8–13 focused hours
Patterns, codes and mental ability
School arithmetic and working reading fluency, with rusty Class X mathematics; first focused CSAT preparation. Learners needing basic literacy or foundational numeracy remediation need a separate diagnostic budget.
Includes
- Assigned explanatory sections and selected worked examples
- Available mapped CSAT questions with untimed then timed attempts
- Mistake analysis and one initial recall review
Separate time needed
- Full-length timed papers
- Later spaced revision
- All optional textbook exercises
- Advanced mathematics beyond Class X or competition-specific high-difficulty extensions
- Optional supplementary exam-book exercises beyond available mapped practice
Editorial planning estimate; not learner timing data
Where to study this topic
- Mathematical Operations ↗
Example 1 only: supplied operator mapping, rewritten expression and final value; exclude the prose asserting division must always precede multiplication
- Order of Operations: BODMAS ↗
Order of Operations through BODMAS summary and first three Examples: equal-precedence operations evaluated left to right
Whole chapter reading
- Alternating number series: worked example ↗
Question 9 and Explanation before Discussion: separate constant odd-position terms from the even-position progression; omit comments
- Analogy: introduction ↗
Definition of analogy and Example 5 only: apply the same numerical transformation to the second pair; other examples excluded
- Classification: worked examples ↗
Directions and Question 3 with explanation only: distinguish the bird that flies from the three flightless birds
- Coding and Decoding Questions and Answers ↗
PDF page 1, Question 2 and solution table: forward/reverse alphabet positions; other questions on this page optional
- Coding and Decoding Questions and Answers ↗
PDF page 9, initial letter-symbol table and Questions 25 and 27 only; Question 26 uses a different table and is excluded
- Coding-Decoding: reverse order ↗
Letter Shift Coding, Pattern 4: Reverse Order and Pattern 5: Reverse + Shift only; exclude Pattern 3 and Solved Examples 5–6
- Mathematical Operations ↗
Example 1 only: supplied operator mapping, rewritten expression and final value; exclude the prose asserting division must always precede multiplication
- Order of Operations: BODMAS ↗
Order of Operations through BODMAS summary and first three Examples: equal-precedence operations evaluated left to right
- Series Completion: repeated letter blocks ↗
Section 5, Directions and Questions 1–2 with explanations: fill gaps consistently with a repeating letter block
- Sequences ↗
Many Rules: a finite prefix alone does not logically force a unique continuation
- Sequences ↗
Arithmetic Sequences definition and worked rule; Many Rules warning about finite-prefix ambiguity
- Sequences ↗
Geometric Sequences: multiplying by a constant and the powers-of-2 example; Many Rules warning
- Powerful Finale ↗
Problem and Student Solutions: repeating four-term unit-digit pattern and locating a term by its cycle position
- Substitution Cipher ↗
Problem, Getting Started and worked letter-pair deductions in Student Solutions; frequency provides a hypothesis checked against words, not a guaranteed ranking
- Excel in Reasoning, ISBN 9789355329455 ↗
Chapters 1–3: Series, Analogy, Classification
Book required · Supplementary - Excel in Reasoning, ISBN 9789355329455 ↗
Chapters 4, 10, 11 and 13: Coding-Decoding, Alphabet Test, Word Formation, Mathematical Operators
Book required · Supplementary - NIOS Mathematics, lesson 7: Arithmetic Progressions ↗
Sections 7.1–7.4
- Concise CSAT—General Studies Paper II, seventh edition, ISBN 9789355327161 ↗
Chapter 5: General Mental Ability
Book required · Supplementary