2210_s26_gt — 2026 May-June Computer Science 2210 Grade Threshold · Cambridge CAIE O Level

Generic descriptions of sensor-based systems instead of applying to the given context

“Very few candidates were able to provide a detailed, technical and accurate response for this question. Many candidates gave a generic description of a system that uses sensors and microprocessors.”— 2210 Paper 1, May/June 2023

How to fix: When a question gives a scenario (e.g. a water tank system), name the specific sensor for that context (e.g. level sensor), describe what it measures, how the microprocessor compares the reading to a stored value, and what output device acts on the decision. Never write a generic 'sensor sends data to microprocessor' answer — always tie every step to the scenario.

Not understanding library routines like DIV and ROUND

“Few candidates understood the purpose of DIV and ROUND. Candidates who understood the library routines were able to give a suitable example.”— 2210 Paper 2, May/June 2023

How to fix: Learn every pseudocode library routine in the syllabus insert: DIV (integer division, e.g. 7 DIV 2 = 3), MOD (remainder, e.g. 7 MOD 2 = 1), ROUND (rounds to specified decimal places), RANDOM, LENGTH, UCASE, LCASE, SUBSTRING. For each, memorise what it does, its syntax, and write a one-line example you can recall in the exam.

Unable to describe sound representation — confusing sample rate/resolution with image concepts

“Few candidates were able to state what is meant by the sample rate and resolution. Some candidates tried to describe the sample resolution in relation to an image.”— 2210 Paper 1, May/June 2023

How to fix: Sample rate = the number of samples taken per second (measured in Hz). Sample resolution (bit depth) = the number of bits used to store each sample. Higher sample rate captures more detail in the sound wave; higher resolution means each sample is more precise. Do not confuse with image resolution (pixels) — these are sound-specific concepts.