Since your admission is already completed, you will need to check with your school or board if they allow you to switch to home-based learning. In Karnataka State syllabus, regular school attendance is usually required, but in special cases like health issues, the school can recommend you for NIOS (National Institute of Open Schooling) or a similar home-study option. I suggest you speak directly with your school principal and explain your health situation, along with medical proof, so they can guide you on the right process.