Hello,

You may plan for different fields. if you are interested in other exams you can apear them too. you just have to satisfy their eligibility criteria which is mostly percentage of 12 th and major subjects like PCM or PCB.

So for your 1st question yes you can appear for any entrance exam you want provided you satisfy the eligibility criteria given by the board else you might get rejected latter.

For NIOS there are some colleges who consider this entrance for admission. So if you score a good mark then you will get high chance and take an admission where you want.

If you want to know anything related to it then visit the official website and get to them to  know which what to do and which one is yours

Hope it helps1