For decades, Problems Plus in IIT Mathematics by A. Das Gupta has been considered the "Bible" for serious JEE Advanced aspirants. Unlike standard textbooks that focus on theory, this book is purely problem-oriented. It bridges the gap between routine board exam questions and the complex, multi-concept problems found in the JEE Advanced.
Unfortunately, I couldn't find a direct link to a PDF version of the solutions to "Problems Plus" in IIT Mathematics by A. Das Gupta. However, I can suggest a few alternatives to help you find the solutions: Navigating "Problems Plus in IIT Mathematics" by A
And then comes the search. The student types: "Problems Plus in IIT Mathematics by A Das Gupta solutions PDF". Treat the solutions PDF as a last resort
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Reverse Engineering: If you do look at the solution, don't just read it. Close the book and try to solve the entire problem from scratch on a blank sheet of paper.