If you manage to locate a legitimate copy (or borrow one from your library), here is the typical chapter structure of S.O. Pillai’s Solid State Physics :
The copyright for Solid State Physics by S.O. Pillai is owned by the publisher (most commonly New Age International Publishers or others in earlier editions). Uploading or downloading unauthorized PDF copies from sites like Library Genesis, Sci-Hub, or student forums is copyright infringement in most jurisdictions, including India (under the Copyright Act, 1957), the US, and the EU. Solid State Physics So Pillai.pdf