Not all scanned books are usable. When you open a Raag Bandish book PDF, check for:
For the serious advanced learner, Raga Darshan is indispensable. raag bandish books pdf
If you have a Bandish PDF but no recording, type the Sargam into a notation software (like Sargam or SwarGram app) to hear the rough melody. Then, practice adding Gamak (oscillations) as described in the book's preface. Not all scanned books are usable