Hey ruchi,

As you have failed in 3 subjects so you cannot appear for supplement or can say only for those subject you have failed in ,you need to repeat your 12th standard again and need to give all the theory exams and practical too , then you will be provided a passed marksheet of class 12th.

There is no other way to get passed ,you need to appear for every subject

I hope it helped you ,one thing i would like to tell you please do not Panic out or worry unnecessary ,just re appear for 12th standard , prepare well and get passed that's it.

For more queries kindly let us know we will be happy to help you

Good luck!