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If you are unable to locate a digital copy of Lee Peng Yee’s text, several world-class, open-access resources cover the exact same mathematical principles for free:
While the story above is the "lore," the practical reality regarding the PDF link is this:
What (e.g., Calculus, Vectors, Induction) are you struggling with?
If you want a direct, legal PDF of Lee Peng Yee’s “Pure Maths” materials, first search the author’s official academic pages and university repositories. If you’d like, tell me which country or university you’re affiliated with and I can look up institutional sources or suitable open-access alternatives.
If you're unable to find a PDF link or prefer alternative resources, here are some suggestions:
Resource: Pure Mathematics for GCE 'O' Level by Teh Keng Seng and Lee Peng Yee is also available in digital, user-uploaded format. 2. Internet Archive (Open Library)
Provides free access to lecture notes and problem sets for foundational mathematics courses.
The "Singapore Method" approach is deeply embedded in these writings.
Remainder and factor theorems, cubic equations, and partial fractions.