Overall Exam Verdict

The 2024 HKDSE Mathematics Compulsory Part Paper 1 was of a moderate-to-high difficulty. While Section A(1) offered straightforward marks on core algebraic topics, Section A(2) and Section B introduced several multi-step questions requiring deep conceptual integration. Candidates with strong procedural skills found the early stages manageable, but those aiming for Level 5 or above had to demonstrate rigorous geometric logic and advanced graph transformation skills.

Where Marks Were Won and Lost

In Section A(1), candidates generally scored well on basic operations like factorization, simplification, and percentage calculations. However, in Section A(2), Question 12 (Coordinate Geometry) proved to be a major hurdle, with many incorrectly assuming perpendicularity between lines without mathematical justification. Similarly, Question 13 (Mensuration) saw many lost marks due to candidates' inability to explain why two pyramids were not mathematically similar.

Section B Examiner Pitfalls

Section B was highly selective. In Question 18 (3D Trigonometry), candidates struggled with planes folding and calculating the correct perpendicular distances. In Question 19 (Functions, Transformations, and Sequences), which carried a heavy weight of 12 marks, a significant number of candidates failed to complete the square correctly when variables \( m \) and \( n \) were involved, and many misunderstood the horizontal enlargement transformation represented by \( f(x/5) \).

Preparation Strategy & Future Predictions

To excel in future sittings, students must move beyond rote memorization. Key strategies include:

  • Mastering Geometric Proofs: Always write down clear reasons (e.g., RHS, similar triangles) instead of assuming visual properties.
  • Deconstructing Transformations: Thoroughly practice horizontal scaling and compound transformations, which are increasingly tested.
  • Time Management: Secure Section A(1) within 35 minutes to leave ample time for the heavy proofs in the later sections.

We predict that upcoming exams will feature more extensive linear programming graphing questions and real-world exponential modeling, both of which were lighter in this session.