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Subjective Copy Checking

Check 100 handwritten papers.
While you finish your evening tea.

Objective MCQs are easy to score, but real board exams depend on long derivations, equations, and explanations. CoachOne reads student handwriting, awards partial step marks, and highlights exactly where marks were lost.

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Step-by-Step Marking

It grades like an experienced board examiner.

CoachOne checks answers against your official marking scheme, giving students step marks for the right formula and substitution even if the final calculation has a small error.

Student Submission SheetClass 12 • Roll #24

Q3: Derive Lens Maker's Formula for thin convex lens.

Let a thin lens of refractive index n2n_2 be placed in a medium of index n1n_1. For refraction at first spherical surface:

Formula Verified
Step 1: Surface 1 Formula Stated Correctly
n2v1−n1u=n2−n1R1\frac{n_2}{v_1} - \frac{n_1}{u} = \frac{n_2 - n_1}{R_1}
Logic Correct
Step 2: Surface 2 & Thin Lens Condition Applied
n1v−n2v1=n1−n2R2\frac{n_1}{v} - \frac{n_2}{v_1} = \frac{n_1 - n_2}{R_2}
Sign Mistake Detected
Step 3: Sign Convention Mistake
Student wrote 1f=(n−1)(1R1+1R2)\frac{1}{f} = (n - 1)\left(\frac{1}{R_1} + \frac{1}{R_2}\right) instead of −1R2-\frac{1}{R_2}.
Multi-page checking Checked in 1.2 seconds

Step Marks Breakdown

Board Marking Scheme Applied

Step 1: Surface 1 Refraction (1.5M)
Correct formula and diagrammatic ray logic
+1.5 / 1.5
Step 2: Surface 2 & Thin Lens Condition (1.5M)
Virtual object assumption correctly framed
+1.5 / 1.5
Step 3: Adding Equations & Focal Length (1.5M)
Algebraic addition steps verified
+1.5 / 1.5
Step 4: Final Sign Convention (0.5M)
Missed negative sign on R2R_2 radius
0.0 / 0.5
Final Question Score
Partial marks awarded fairly
4.5 / 5.0
How It Works

How your center checks 100 papers in 4 steps

Designed to fit your daily center routine without requiring special scanners or technical training.

1. Scan Copies in One Go

Collect answer sheets after the test. Feed the stack through any office scanner as one single PDF. CoachOne splits pages automatically by roll number.

2. Clean Handwriting Reading

The system transcribes student handwriting, recognizes strike-throughs, and reads equations, chemical formulas, and diagrams with high accuracy.

3. Step-by-Step Board Grading

Evaluates each question against your answer key. Awards marks for formula recall, correct values, and intermediate steps just like board examiners.

4. Teacher Review & Fast Approval

Messy or unclear handwriting is flagged for a quick teacher look. Teachers can adjust marks with one click before reports are sent to parents.

96.4% Evaluator Accuracy

Benchmarked against blind manual checks by senior board paper examiners.

Zero Teacher Burnout

The 100th paper is checked with the exact same focus and care as the 1st paper.

Consistent & Fair Marking

Every student is scored against the same step rules, giving parents complete trust in test results.