Master the Pearson Edexcel International GCSE (9-1) Computer Science exam with this examiner-backed guide. Learn how to avoid common pitfalls in binary shifts, network comparisons, flowchart design, and practical programming questions to secure top marks.
อ่าน 3 นาทีอัปเดตเมื่อ: 21 มิ.ย. 2569
ภาพรวมข้อสอบ
จำนวนฉบับ
2
คะแนนเต็ม
160
เวลาสอบ
5ชม.
ประเภทคำถาม
3
ฉบับ
เวลา
คะแนน
จำนวนข้อ
น้ำหนักคะแนน
ประเภทคำถาม
Paper 1: Principles of Computer Science
2ชม.
80
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—
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Paper 2: Application of Computational Thinking
3ชม.
80
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—
เกณฑ์เกรด
987654321U
ข้อกำหนดเครื่องคิดเลข
A scientific or graphical calculator is permitted. Graphical calculators must be in exam mode with all stored programs and data cleared before the exam; the calculator must not be able to retrieve stored text or formulae.
AO1: Demonstrate knowledge and understanding of the key concepts and principles of computer science. (37.5%)
AO2: Apply knowledge, understanding and skills to solve problems, design systems and write/refine algorithms. (47.5%)
AO3: Analyze and evaluate computer science systems, make judgements and present reasoned conclusions. (15%)
วัตถุประสงค์: Tabulate \(y\) across a range of \(x\) to locate sign changes (roots) and approximate maxima/minima.
ใช้เมื่อใด: Solving or sketching a function when you want to find where its graph crosses or turns.
ขั้นตอน
Enter the function in TABLE mode, set the start, end and step, then read where the sign of \(y\) changes or where it peaks.
ข้อควรระวังในการสอบ: Allowed, but clear stored programs/data (graphical calculators in exam mode) and show the required working — unsupported calculator answers score no method marks.
Statistics mode (mean, SD & regression)
Scientific calculator (e.g. Casio fx-991 series)
วัตถุประสงค์: Read the mean \(\bar{x}\) and standard deviation directly, and the gradient/intercept (and \(r\)) of a linear regression for bivariate data.
ใช้เมื่อใด: Any data-handling, statistics, or required-practical analysis question.
ขั้นตอน
Enter the data in STAT mode (1-VAR or A+BX), then recall \(\bar{x}\), \(\sigma\) or the regression coefficients.
ข้อควรระวังในการสอบ: Allowed, but clear stored programs/data (graphical calculators in exam mode) and show the required working — unsupported calculator answers score no method marks.
Carry exact values with Ans & memory
Scientific calculator (e.g. Casio fx-991 series)
วัตถุประสงค์: Keep full-precision intermediate values to avoid rounding errors.
ใช้เมื่อใด: Multi-step calculations where premature rounding loses the final accuracy mark.
ขั้นตอน
Use Ans, STO/RCL or the M+ memory to reuse the unrounded result of each step; round only the final answer.
ข้อควรระวังในการสอบ: Allowed, but clear stored programs/data (graphical calculators in exam mode) and show the required working — unsupported calculator answers score no method marks.
Equation solver — to CHECK your working
Scientific calculator (e.g. Casio fx-991 series)
วัตถุประสงค์: Use the built-in EQN/SOLVE mode to verify roots of quadratics or simultaneous equations you have already solved by algebra.
ใช้เมื่อใด: As a check only, after solving by hand.
ขั้นตอน
Enter the coefficients in EQN mode (or use SOLVE) and confirm they match your worked solution.
ข้อควรระวังในการสอบ: Allowed, but clear stored programs/data (graphical calculators in exam mode) and show the required working — unsupported calculator answers score no method marks.
ข้อผิดพลาดที่พบบ่อย
1highคะแนนที่เกี่ยวข้อง: 2Networks
Stating both poles of a relative parameter as two distinct differences in network questions (e.g. 'WAN has higher latency' and 'LAN has lower latency').
วิธีหลีกเลี่ยง: Compare two completely different characteristics (e.g. latency for one mark, and geographical coverage or ownership for the second mark).
2mediumคะแนนที่เกี่ยวข้อง: 1Binary
Failing to retain the sign bit when implementing arithmetic right shifts, or incorrectly padding the left side.
วิธีหลีกเลี่ยง: In Two's Complement representation, when executing an arithmetic right shift, always copy the most significant bit (the sign bit) into the newly vacated bit positions on the left.
3highคะแนนที่เกี่ยวข้อง: 1Algorithms
Omitting direction indicators/arrows on the lines connecting process blocks in flowchart diagrams.
วิธีหลีกเลี่ยง: Ensure every line connecting shapes in a flowchart has a clearly visible arrowhead to explicitly demonstrate the sequence flow of the algorithm.
4mediumคะแนนที่เกี่ยวข้อง: 2Data types and structures
Hardcoding array offsets (e.g., substituting index 10 directly for structural replacements) instead of dynamically checking boundaries.
วิธีหลีกเลี่ยง: Use dynamic boundary boundaries, such as len(array) or array.Length, and programmatically locate terminal empty elements using loops rather than fixed indices.
5mediumคะแนนที่เกี่ยวข้อง: 1Input/output
Failing to close open file handles at the end of output text file streams.
วิธีหลีกเลี่ยง: Always invoke the .Close() method (e.g. writer.Close() in C# or file.close() in Python) to release OS file locks and secure data writing.
6mediumคะแนนที่เกี่ยวข้อง: 3Data storage and compression
Describing optical storage mechanics (lasers, lands, and pits) when asked to describe how data is read from magnetic platters.
วิธีหลีกเลี่ยง: For magnetic storage, detail how platters spin, read/write heads detect changes in magnetic polarity, and how polarities translate to binary 1s and 0s.
7highคะแนนที่เกี่ยวข้อง: 2Algorithms
Updating all columns simultaneously on every row of the trace table, rather than only changing values on a new row when states alter.
วิธีหลีกเลี่ยง: Only record a value in a trace table on a new line when that specific variable's state has changed. Leave other cells in that row blank until they are modified.