The "free" PDF often costs you more in lost time due to missing content, physical eye strain, and the risk of studying the wrong syllabus. Moreover, Telegram links are often taken down due to DMCA copyright claims, so a link that works today will be dead tomorrow.
Once you join a large educational group or channel, use the internal search bar. Type keywords like "S.L. Arora," "Physics Class 12," or specific chapter names like "Semiconductors" or " s.l. arora physics class 12 pdf telegram
: A popular channel for medical and board exam aspirants that shares relevant physics PDFs. The "free" PDF often costs you more in