The Daniel Math Store · Red Ink Service
The Mistakes Only a Teacher Catches
Send in your solved problems every week and get them back the way Daniel Sir has marked papers for thirty years — every step checked, every mistake circled in red, every gap named. Not an answer key. A teacher actually reading your working.
₹2,499/month
You Can Get the Right Answer for the Wrong Reason
A correct final answer can hide a genuine gap in understanding — a lucky cancellation, a memorised shortcut applied without knowing why it works. Daniel Sir’s red pen review has spent three decades catching exactly this: not just whether the answer is right, but whether the reasoning that got you there will hold up on a harder question. That’s the difference between surface-level recognition and genuine understanding — and it’s the one thing no solved-example PDF can ever check for you.
How It Works
Four Steps, Every Week
1. You Solve
Work through a set of problems from your current chapter or module, showing full working.
2. You Submit
Send in photos or scans of your solved sheets — no special format needed.
3. Sir Marks
Every step reviewed in red ink — correct reasoning confirmed, errors named specifically.
4. You Return
Get your marked sheets back with clear notes on exactly what to fix before the next set.
Find Out What Your Working Is Actually Saying
Join Red Ink from ₹2,499/month. Enquire now to start this week.