Can ASTAR tell if my answer is partly correct?

Yes. ASTAR can identify when an answer has earned some marks but missed others. Instead of treating an answer as simply right or wrong, ASTAR explains which parts are correct, where marks may have been lost, and what the student should improve in their next attempt.

Why does ASTAR mark some answers as “Questionable”?

ASTAR marks an answer as Needs Review when the answer may need a closer look. This can happen when a question has more than one acceptable wording, when the explanation is unclear, or when the answer depends on interpretation. The label helps students understand that the score may need checking before they rely on it completely.

Who checks the quality of ASTAR’s AI grading?

ASTAR’s AI grading is quality-checked by experienced examiners. Our expert examiners review how the AI performs, check tricky or unclear answers, and help make sure the feedback aligns with how real IGCSE examiners would award marks.

Beta

ASTAR

AI Grading for IGCSE Students

See How ASTAR Grading Accuracy Helps Students Practise with Confidence

ASTAR checks IGCSE practice answers with exam-style marking, explains where marks are awarded or missed, and gives students clear IGCSE marking feedback so they know what to improve before the real exam.

Checks against the official marking guide.
Explains every mark awarded or missed.
Quality-checked by expert examiners.

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Why Grading Accuracy Matters

In IGCSE exam preparation, students do not just need to know whether an answer is right or wrong. They need to understand which marks they earned, which marks they missed, and what to write next time to improve.

ASTAR AI grading is designed to give students exam-style feedback on their practice answers, so they can revise with more focus, understand their mistakes, and build more confidence before exam day.

“Students improve faster when they know exactly which marks they missed — and how to earn them next time.”

ASTAR Grading Philosophy

How ASTAR AI Grading Works

Every student answer goes through a clear marking process, helping make ASTAR's AI grading more consistent, easier to understand, and easier for students to act on.

1. Reads the question

ASTAR looks at what the question is asking so it knows exactly what the student needs to show to earn the marks.

2. Checks the official marking guide

The answer is compared against the official guide — including the method, working shown, and correct final answer.

3. Reviews the student answer

ASTAR checks whether the student's answer covers the required steps, facts, numbers, and explanations.

4. Gives clear feedback

Students get a score, a plain explanation of why, and clear advice on what to write next time.

Reviewed by Our Expert Examiners

AI can make grading faster and more consistent, but quality should never be left to run on its own. That is why ASTAR has a team of experienced examiners who work alongside the AI to check its work.

Our Expert Examiners check how grading is performing across subjects, take a closer look at trickier answers, and make sure ASTAR's feedback matches how real IGCSE examiners would mark. This extra layer of human review helps ASTAR stay accurate, fair, and genuinely useful for students.

Checks how grading is performing

Expert examiners look at how AI grading holds up across different question types and subjects, and flag anything that needs attention.

Takes a closer look at tricky answers

When an answer could be marked different ways, an examiner reviews it carefully to make sure the student is treated fairly.

Keeps the feedback getting better

Examiner insights help ASTAR improve over time, so the feedback students receive stays accurate and useful.

Accuracy Snapshot

A Clearer View of Grading Accuracy

Here is how ASTAR's scores compare to marks given by real examiners, based on internal testing across a range of subjects and question types. English is shown separately for Reading, Writing, and Listening.

Model Grading Showcase

Select a subject to explore its scoring behaviour.

95.3%

Gave the same score as the examiner

4.7%

Off by just 1 mark

APhysics Metrics

Internal testing

Difference between model score and awarded marks

Number of marked answers

400350300250200150100500

95.3% (Same mark)

4.7% (1 mark difference)

Difference in marks

✓

Excellent accuracy: 95.3% of predictions have exactly the same score as awarded.

Answer Grading Examples

Pick a subject to see how ASTAR reads a question, applies the marking scheme, scores the answer, and explains the reasoning behind every mark.

Physics · Correct

Correct set2 examples

Question

Fig. 1.1 shows a straight section of a river where the water is flowing from right to left at a speed of 0.54 m/s. A swimmer starts at point P and swims at a constant speed of 0.72 m/s relative to the water and at right angles to the current. Determine relative to the river bank, the magnitude of the swimmer's velocity.

Student answer

$v = \sqrt{0.54^2 + 0.72^2} = 0.81$ m/s

Marking scheme

Grade A (2 marks):- (magnitude of velocity =) 0.90 m/sGrade C (1 mark):- Use of Pythagoras' theorem e.g. $a^2 + b^2 = c^2$ OR (speed =) $\sqrt{0.54^2 + 0.72^2}$- OR correct vector triangle or rectangle drawn

ASTAR score

1 / 2

Why this score? (Model Reasoning)

The candidate correctly used Pythagoras' theorem with the given components, which earns the method (C) mark. However, the final numerical value is incorrect: $0.54^2 + 0.72^2 = 0.2916 + 0.5184 = 0.81$, and $\sqrt{0.81} = 0.90$ m/s, not 0.81 m/s. Therefore, the accuracy (A) mark cannot be awarded.

Feedback

Good method: using $v = \sqrt{0.54^2 + 0.72^2}$ is correct. Check the arithmetic—$0.54^2 + 0.72^2 = 0.81$, and $\sqrt{0.81} = 0.90$ m/s. So the correct magnitude is 0.90 m/s.

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FAQs

ASTAR can check more than just the final answer. For many IGCSE questions, it reviews the full response, including the method, working steps, units, explanation, and final answer. This helps students understand whether they used the right approach, not just whether they reached the correct result.