hi tarun

there is no problem in rewriting the board exams but you need to come from 1st year again as a new begginer.

the thest work is that you have to start up working on your career from now as there wont be much difference i  pursuing the long term as i noticed my friends who have done the long term.as per them the long term doesnt have much effect on most of the students.

if you have confidence doing great in longterm then you may go with it.