Hello John,

Any student who is studying both Biology and Mathematics in class 12th will have to study all the topics/chapters in that subject. So, if you are take up Biology, you will study - Reproduction in Organisms, Sexual Reproduction in Flowering Plants, Human Reproduction, Reproductive Health, Principles of Inheritance and Variation, Molecular Basis of Inheritance, Evolution, Human Health and Diseases, basically every courses.

And if you take up Maths, you will end up studying - Relations and Functions, Inverse Trigonometric Functions, Matrices, Calculus, Applications of Derivatives, Applications of the Integrals, Vectors and Three-Dimensional Geometry.