Hello Student,

Why repeat class 12 after passing it. If you're thinking that you hadn't scored well enough for competitive exam like whichever you're going to apply as you haven't mentioned here so i'm supposing it would be JEE/NEET

Focus on whats coming next after class 12 and complete the preparation on daily basis, solve numerical, more and more problems.

As per the eligibility criteria of JEE/NEET the student have appeared/passed class 12 or equivalent exam Only Once with respective subject required.

He/She may not be able to attempt exam if he/she is found to be involved in any kind of unfair means and will be debarred from attempting future examination conducted by them.

Hope this information helps you a lot.

Best Wishes