CBSE

You don't have to reappear from open school. Two chances are given during which you can reappear from the regular board.

Hi,
If you want to study Bachelor's degree, your academic record from 10th to 12th will be checked. Change of board is fine and I don't see any reason why it should have a negative impact on you admission. You must meet the admission requirements importantly, have good grades and take the IELTS.

Yes, of course, you can but should be focused.
All the best.

Hi Gurjot,
Do whatever interests you. Moreover, it is not mandatory to go abroad for higher studies. If you don't know what you want you should study here and find out your interest.

Of course, you can appear for the exam since the only requirement to be eligible for JEE exam is to pass 12 from PCM. That set. Best wishes!

If you are only worried about scoring marks, no need to study books thoroughly, just download previous 5 -10 years paper and go through it thoroughly. It is sufficient to score 65+ marks.
I have already tried it.

Yes, you can take admission in B.Tech in IIMT Group College.