Cambridge As and Alevel (CIE) Computer Science (9618)Paper 2 Chapter Summary Notes (Chapter 9 to 12 - Practical/Programming)

This is a summary of chapter 9-12 of the Cambridge As Level Computer Science (9618) syllabus, written before as exam preparation for the AS level Computer Science Paper 2 component (comp. 22, taken in the October/November 2025 series, which resulted in an A (a) grade for the whole Computer Science AS Level series (P12, 22), with a 90 PUM). Chapters covered in this set of notes include: - Ch. 9: Algorithm Design & Problem Solving - Ch. 10: Data types & structures - Ch. 11: Programming - Ch. 12: Software Development The content of each chapter in these sets of notes was a combination of topics that are easily tested/understandable (“bonus”), topics that frequently come out and are hence covered, and potential topics that may come out. The content was also influenced a bit by questions that came out in my school’s chapter tests, Mock exams and Preliminary exams (prelims). Hence, there may be topics that may not be fully covered in these notes or are briefly touched upon, so it is advised to review these alongside one’s other revision materials (textbooks, notes, PYPs, etc.) Due to limited space (and time) at the time of writing these notes, most terms/ words may be acronymed (eg: alg. = algorithm), but I hope they are still understandable depending on the context it is in. Additional note: Even though the paper has a significant amount of Pseudocode questions, there is not really a singular comprehensive guide on how to write Pseudocode in these notes, to which the extent of it is for different data type structures (eg. Records, File Handling) or the structure of how to code an algorithm. The notes mainly focus on the more theory-based questions in the paper. Hope these notes help, all the best and good luck for your exams! - Paris