12th Biology Guides Namma Kalvi » 12th Standard Study Materials » 12th Biology Study Materials » 12th Biology Guides 12th Biology Notes – Minimum Learning Material (கற்றல் கையேடு) | CEO, Chennai – Tamil Medium – Preview & Download (MAT.NO. 221237)12th Biology Notes – Minimum Learning Material (கற்றல் கையேடு) | CEO, ThiruvallurTamil Medium – Preview & Download (MAT.NO. 217020)English Medium – Preview & Download (MAT.NO. 218059)