If you are looking for a historical version, try searching for "Sangita Bala Padam" (with a 'g' instead of 'ge') on Archive.org. Some older, pre-1960 editions may be scanned. However, these lack the later revisions and raga classifications of the modern version.
This volume is designed for students who have mastered basic exercises (like Sarali Varisai sangeetha bala padam varnam pdf link
While this is a copyrighted textbook published by , several digital versions and previews are available on document-sharing platforms: Sangeetha Bala Padam Volume 1 If you are looking for a historical version,
If you are looking for specific Varnams rather than the whole book, these resources are invaluable: This volume is designed for students who have
The is a standard foundational text for Carnatic music students, typically divided into two volumes. While Volume 1 covers early basics (Sarali Varisai to Swarajatis), Volume II (Varnam)
The series is designed as a progressive journey through the world of South Indian classical music: The Foundation (Part I)