Hi,

I hope you are doing good. As you are giving your second attempt as a private candidate, you will be required to register for the board exam through there official website. After successful registration, you will be asked to submit certain important documents like ID proof, latest photograph etc. and might includes your this year result.

But you will have chance to better perform this year, and your best marks from both will be considered. You do not need to re-attempt the practicals, and your previous marks will be forwarded this time.

Yes, you will be eligible for the the entrance exams like JEE, as they have set there criteria from minimum 75% to just need to pass plus two. But, it is recommended to score well as it will help you greatly in future.

All the best.