Master Cambridge IGCSE Combined Science (0653) with examiner-backed insights, time-management techniques, and targeted strategies to avoid critical pitfalls in Biology, Chemistry, and Physics.
อ่าน 5 นาทีอัปเดตเมื่อ: 21 มิ.ย. 2569
ภาพรวมข้อสอบ
จำนวนฉบับ
3
คะแนนเต็ม
160
เวลาสอบ
3ชม.
ประเภทคำถาม
3
ฉบับ
เวลา
คะแนน
จำนวนข้อ
น้ำหนักคะแนน
ประเภทคำถาม
Paper 2: Multiple Choice (Extended)
45นาที
40
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Paper 4: Theory (Extended)
1ชม. 15นาที
80
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—
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Paper 6: Alternative to Practical
1ชม.
40
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—
เกณฑ์เกรด
A*ABCDEFGU
ข้อกำหนดเครื่องคิดเลข
A silent scientific calculator may be used on papers where calculators are permitted (some papers are non-calculator). It must not be graphical or programmable and must hold no stored information.
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 on papers where a calculator is permitted; use a silent scientific calculator with no stored content and show your method.
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 on papers where a calculator is permitted; use a silent scientific calculator with no stored content and show your method.
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 on papers where a calculator is permitted; use a silent scientific calculator with no stored content and show your method.
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 on papers where a calculator is permitted; use a silent scientific calculator with no stored content and show your method.
ข้อผิดพลาดที่พบบ่อย
1highคะแนนที่เกี่ยวข้อง: 1Organic chemistry
Stating that a hydrocarbon contains carbon and hydrogen, but omitting the word 'only'.
วิธีหลีกเลี่ยง: Always define a hydrocarbon as a compound made of hydrogen and carbon ONLY.
2highคะแนนที่เกี่ยวข้อง: 2Motion, forces and energy
Failing to convert mass in grams to kilograms when calculating Weight (W = mg) or Gravitational Potential Energy (GPE = mgh).
วิธีหลีกเลี่ยง: Divide the mass in grams by 1000 to convert to kilograms before multiplying by g (9.8 m/s²).
3highคะแนนที่เกี่ยวข้อง: 1Electricity
Forgetting to take the reciprocal at the final step when calculating combined resistance of parallel resistors.
วิธีหลีกเลี่ยง: After finding the sum of 1/R1 + 1/R2, use the 1/x (or x⁻¹) button to flip the fraction back to obtain the final resistance.
4mediumคะแนนที่เกี่ยวข้อง: 1Waves
Drawing messy, freehand lines or sketchy/double lines for light rays on reflection or lens diagrams.
วิธีหลีกเลี่ยง: Always use a sharp HB pencil and a clear ruler. Draw a single, clean, continuous straight line to represent each ray of light.
5mediumคะแนนที่เกี่ยวข้อง: 1Reproduction
Stating that human fertilisation occurs in the uterus.
วิธีหลีกเลี่ยง: Remember that fertilisation takes place in the oviducts (fallopian tubes), while the fetus develops in the uterus.
6highคะแนนที่เกี่ยวข้อง: 2Experimental techniques and chemical analysis
Using vague qualitative language such as 'the temperature changes' or 'be careful' in Paper 6 planning and design questions.
วิธีหลีกเลี่ยง: State exact quantitative directions ('the temperature decreases') and specify precise apparatus controls ('use a water bath to maintain a constant temperature').