I've done 11th commerce mp board and in 12th i want to switch to biology is it possible and how

In general, switching directly from Class 11 Commerce to Class 12 Biology under MPBSE is usually not permitted , because Class 11 and Class 12 are treated as a continuous course of study and students are expected to continue with the stream registered in Class 11.

If you want to move to Biology, common options include:

• Repeating Class 11 with the Science (PCB) stream , which provides the necessary foundation in Physics, Chemistry, and Biology.
• Completing Class 12 in Commerce and later pursuing additional qualifications through open schooling systems such as National Institute of Open Schooling if Biology is required for future studies.
• Exploring alternative courses whose eligibility criteria do not require a Class 12 Science background.

The exact rules can vary based on current Madhya Pradesh Board of Secondary Education regulations and school policies, so it is advisable to confirm with your school and the board before making any decisions.