Optimafor test series
Try it free

For JEE test series & coaching institutes

Your students lose marks to the same silly mistakes, test after test. Want to show them which ones?

A student reopened his notebook on exam morning.

Sample test-series results page with the Error Notebook tab open: marks each habit cost across Mock 3 and Mock 4, and the Calculation slip questions.

Optima plugs into your test results to show each student the exact step where their rough work broke, and tracks their repeat habits across your mocks.

  • Works inside your portal, or as private links within 12 hours
  • Zero tech setup to try it on your next test
Try it free on 1 test

Most test analysis stops at chapter scores and solutions. Optima goes down to the exact slip.

Same question, same student.

JEE Main 2025 · 28 Jan · Shift 2 · Maths · MatricesPublic question

Let A = 1/√2−201 and P = cos θ−sin θsin θcos θ, θ > 0. If B = PAPᵀ, C = PᵀB¹⁰P and the sum of the diagonal elements of C is m/n with gcd(m, n) = 1, then m + n is:

Your answer (4) 2049 ✗Correct (3) 65 ✓
Typical test analysisSample
Maths accuracy64%
Time on this question4m 12s
Chapter-wise marks · Maths
Matrices3/12
Vectors8/8
Probability4/8
Solution
  1. 1B¹⁰ = PA¹⁰Pᵀ
  2. 2C = PᵀB¹⁰P = A¹⁰
  3. 3A is upper triangular, so the diagonal of A¹⁰ is (1/√2)¹⁰ and 1
  4. 4Trace = 1/32 + 1 = 33/32
  5. 5m + n = 65

The right method, but not where his went off.

With Optima
Error notebook · Mock 4 · Q1Sample
Maths · Matrices Calculation slip Repeat · also in Mock 3

Method right. A square root dropped at the last step.

High confidence
  1. 1P cancels out, so C = A¹⁰ and the trace is (1/√2)¹⁰ + 1. ✓ right idea
  2. 2
    You stopped here You:  (√2)¹⁰ = 2¹⁰ = 1024 → 1025/1024 ✗ Right: (√2)¹⁰ = 2⁵ = 32 → 33/32 ✓ √2 to the 10th is 2⁵, not 2¹⁰.
  3. 31025/1024 → m + n = 2049 (33/32 → 65)

Why high confidence: dropping the √ gives exactly 1025/1024, so m + n = 2049, the option he marked.

Rule to keep (√2)ⁿ = 2n/2: halve the power.
His habits · Mock 3 & 4 · Sample
  • Mock 3 · Q9 · Maths · Matrices(√3)⁴ taken as 3⁴, not 9
  • Mock 4 · Q1 · Maths · Matrices(√2)¹⁰ taken as 2¹⁰, not 2⁵ (this question)
  • Mock 4 · Q34 · Physics · ThermodynamicsDropped a minus sign while adding the work done

What students did in our beta

They found Optima on a mock tracker, right after logging a test. No coaching centre, no push from us.

About 2 in 3

Tapped through right after logging a test.

Optima showed up as an optional card after they logged a mock. No push from a teacher or institute.

Up to 4 min

They read the step, not just the answer.

Students spent 1.5 to 4 minutes on the one or two slips they didn't know they made, and nearly every answer to "Was this your mistake?" was Yes.

Almost half

They came back on their own.

Almost half sent their next mock without a reminder, and they were the ones reading "Before your next mock". One reopened his notebook late at night, then twice on exam morning.

And the diagnoses hold up: 93% of the 71 we've sent, with students flagging only 5 as wrong.

Try Optima free on your next test

Works best on an upcoming free or open mock: every student who takes it gets their own error notebook within 12 hours.

  1. Share one test.

    Send the paper and answer key before the test, and the response sheet after.

  2. We build the notebooks.

    No code or installation needed from your team.

  3. Share with your batch.

    Send the private links to your students, and see who opens and reads them.

Try it free on one test

Leave your details and we'll WhatsApp you within a few hours to take your next test paper. Or message us right now.

💬 Chat with us on WhatsApp →

Your students and your data

No student phone numbers or emails.

Send an anonymous student ID or roll number with the responses. We never collect students' contact details, so your student list stays with you.

Your papers stay yours.

Your questions and answer keys are used only to build your students' notebooks: never republished, never shared, never added to anyone else's question bank.

Private notebooks.

Every student gets their own unguessable link, or sees it inside your portal. Nothing is public, searchable or visible to other students.

You stay in control.

We keep only what the notebook needs (the student ID, the test and the marked answers) and delete your batch's records when you ask.

About Optima

We are an IIT Kharagpur-founded edtech team with 12+ years of experience building enterprise AI and analytics products. We built Optima because every topper keeps an error notebook, yet most students never find out where they're losing marks after an exhausting 3-hour mock. We partner with forward-thinking test series to make post-mock error diagnosis automatic for every aspirant.

Optima on LinkedIn → Founder on LinkedIn →

Questions first? Ask us directly.

Chat with us on WhatsApp or try it free on one test ↑