However, students often find community-shared resources or partial guides on academic platforms: Online Solution Resources Some users have uploaded documents titled " A Das Gupta IIT Mathematics Solutions
The Best Maths Books to Prepare for JEE Main + Advanced - CatalyseR
But yes, a reference PDF of authentic solutions is acceptable under two conditions:
First published by Bharti Bhawan, "Problems Plus in IIT Mathematics" is not for the faint-hearted. Unlike standard textbooks (like RD Sharma or NCERT) that build concepts gradually, "Problems Plus" is a curated collection of problems.