Maximize your Pearson Edexcel IGCSE Mathematics (Specification A) score with examiner-backed insights. Master scale factor conversions, bounds pairing, algebraic fraction proofs, and strategic calculator verification.
อ่าน 4 นาทีอัปเดตเมื่อ: 21 มิ.ย. 2569
ภาพรวมข้อสอบ
จำนวนฉบับ
2
คะแนนเต็ม
200
เวลาสอบ
4ชม.
ประเภทคำถาม
3
ฉบับ
เวลา
คะแนน
จำนวนข้อ
น้ำหนักคะแนน
ประเภทคำถาม
Paper 1H: Higher Tier
2ชม.
100
29
50%
Short Answer, Structured, Complex
Paper 2H: Higher Tier
2ชม.
100
28
50%
Short Answer, Structured, Complex
เกณฑ์เกรด
987654321
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: AO1: Demonstrate knowledge, understanding and skills in number, algebra, geometry and statistics (60%)
AO2: AO2: Mathematical reasoning and proof (25%)
AO3: AO3: Mathematical problem solving in a range of contexts (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: 4Similarity
Applying linear scale factor multiplier directly to volume or surface area calculations for similar solids.
วิธีหลีกเลี่ยง: Always square the linear scale factor (k^2) for area ratios, and cube it (k^3) for volume ratios. If given volumes first, find the linear scale factor by taking the cube root.
2highคะแนนที่เกี่ยวข้อง: 5Degree of accuracy
Incorrect pairing of bounds during division or subtraction, such as calculating fraction bounds as Upper/Upper instead of Upper/Lower.
วิธีหลีกเลี่ยง: To find the upper bound of a division formula, divide the upper bound of the numerator by the lower bound of the denominator. For subtraction, use Upper - Lower.
3highคะแนนที่เกี่ยวข้อง: 2Trigonometry and Pythagoras’ theorem
Premature rounding of intermediate decimals (such as intermediate lengths or angles) mid-calculation, compromising the final accuracy.
วิธีหลีกเลี่ยง: Carry the full calculator precision in your working, or store intermediate values in your calculator memory. Round only at the very final step.
4mediumคะแนนที่เกี่ยวข้อง: 2Vectors
Failing to write down a collinearity statement when proving three points lie on a straight line using vector proofs.
วิธีหลีกเลี่ยง: After showing one vector is a multiple of the other (e.g., AB = k * BC), explicitly state that the vectors are parallel and share a common point (B), therefore the points lie on a straight line.
5highคะแนนที่เกี่ยวข้อง: 3Probability
Assuming replacement in probability tree questions and using constant denominators for subsequent events when the context is 'without replacement'.
วิธีหลีกเลี่ยง: Carefully read the question for phrases like 'does not replace.' If items are not replaced, reduce both the numerator and the denominator by 1 on subsequent branches.
6mediumคะแนนที่เกี่ยวข้อง: 3Percentages
Treating compound interest or depreciation as simple interest, multiplying the principal directly by the interest rate or neglecting the exponential power.
วิธีหลีกเลี่ยง: Use the compound interest formula: Principal * (Multiplier)^n, where n is the number of years. For depreciation, the multiplier is less than 1.
7mediumคะแนนที่เกี่ยวข้อง: 1Powers and roots
Simplifying algebraic indices incorrectly, such as assuming (6m)^0 simplifies to 6 instead of 1.
วิธีหลีกเลี่ยง: Remember that any non-zero term raised to the power of 0 is strictly equal to 1, i.e., (6m)^0 = 1, whereas 6m^0 = 6 * 1 = 6.