Hello,

I hope you are doing well, If you passed your exams without failing in any of your subjects but somehow your mathematics mark was the lowest then you can surely appear for the improvement exam next year. But i would suggest you to take admission in school which provides admission in 12th science on the basis of Entrance exam. There are many schools out there which don't ask about your 10th marks. You should keep in mind that the syllabus of 12th boards are same for every school. They teach NCERT in all school. If you prepare well and study hard then it really does not matter from which school you are appearing for the 12th boards. You should consider in mind what are you going to do when you complete your 12th exam and should prepare for that without caring much about 12th boards.

I hope you find this information helpful. I wish you all the best for your future.

Good Luck