If you're preparing for YKS, buying the original book (around 100–150 TL new) ensures you get the video access code and clean print. Some second-hand buyers sell used copies with intact codes.
It sounds like you're looking for a of the "3D TYT Matematik Video Destekli Defter" (a popular Turkish math study book for the TYT exam), possibly shared via Telegram . 3d Tyt Matematik Video Destekli Defter Pdf Telegram