MarginIIT Madras
Sign inCreate account
Indian Institute of Technology Madras logo IIT Madras · Assignment evaluation

Handwritten work, marked the way a good TA marks.

Instructors upload a worked solution once. Students photograph their answer sheets. Margin reads the handwriting and the circuit diagrams, checks every final answer against yours, and writes feedback a student can act on.

Get started Sign in

Your solution is the reference. Numbers are checked in code, never guessed.

EE1101 · Tutorial 3
Marked
Question 2 · Thevenin
Short A–B, KCL at node 1:
(V₁ − 12)/4 + V₁/6 + V₁/3 = 0
V₁ = 4 V
Isc = V₁/3 = 1.33 A
Rth = 2.4 Ω
Question 29 / 10
Done well

Your KCL equation at node 1 is set up correctly, and short-circuit current is a valid route to Rth.

Expected

State Vth before dividing: 3.2 V over 1.33 A gives the 2.4 Ω you wrote.

Step skipped −1Alternative method

How it works

  1. Step 1

    Upload your solution

    A scan or a PDF of your worked solution. Margin extracts each final answer and the key steps; you check them and publish.

  2. Step 2

    Students submit their sheets

    They pick the course code, enter their roll number and upload photos or a PDF. Paper and tablet ink both work.

  3. Step 3

    Marks with written feedback

    Every question gets marks, itemised deductions and a note on what was expected. Anything unusual comes to you for review.

Fair to students, accountable to you

Built around how engineering answers are actually marked: credit for the method, care with the numbers, and a person in the loop.

Your solution is the reference

The marker compares against your worked solution and answer keys, not against its own attempt at the problem.

Lenient on method, firm on answers

A different valid method earns full credit. Rounding is forgiven. A wrong result stays wrong, whatever the working looks like.

Identity checks

The course code and roll number written on the sheet are checked against what the student entered, their account and your roster.

Handwriting check

Pages that look typed or printed in a handwriting font are flagged. Real pen and stylus writing is never identical twice.

Feedback in a marker's voice

Short, specific notes: what was done well, what was expected, what to do next time. No cheerleading, no filler.

Runs on free tiers

Deploys to Vercel or Netlify with a free Postgres database. Use Groq, OpenAI, or a model you host yourself.