Older editions that might no longer be in print but contain "classic" problems favored by veteran teachers.
If budget is a constraint, instead of searching for risky “repack” PDFs, use these that match A. Das Gupta’s difficulty: a+das+gupta+maths+mcq+pdf+drive+repack
From a utilitarian perspective, one might argue: If a book is out of print or too expensive, piracy democratizes education. But A. Das Gupta’s book is in print and affordable. Moreover, the “repack” removes the publisher’s revenue, discouraging future editions. Indian copyright law (Copyright Act, 1957) is clear: unauthorized reproduction and distribution constitute infringement. However, enforcement against individual Drive links is nearly impossible. The real victims are not multinational corporations but small academic publishers and authors who rely on modest royalties. Older editions that might no longer be in