Hello Aspirant.
Yes, you can do this. You can re-register yourself in class 11 from a different school if you fail in class 12th.
This is quite a brave decision and it'll eventually help you get your basics strong and perform well in whatsoever stream you want to pursue ahead in your life.
Best of luck !
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile