Always respect copyright laws. Prefer government portals and author-approved distributions. Here are the legitimate sources:
While the following core reference books are often in English, they are frequently used alongside Tamil medium materials for better conceptual clarity: Basic Civil Engineering by Satheesh Gopi civil engineering tamil medium books pdf
For students preparing for TNPSC Technical Civil Exams (e.g., AE, JE, Technical Assistant), many Tamil question banks are available on YouTube and specialized book sites. Draughtsman Civil (Std12 - Tamil Medium) - Internet Archive 10 Oct 2011 — Always respect copyright laws