Hello,

The scenario is like there are candidates who have categorical reservation and also belongs to EWS category for low annual income. If you belong to that then you can apply for both. If you didn't belong to that and you applied then better you change your application form else your application will be rejected later if you won't be able to show the prove.

So think twice before doing anything.

For the second part of your question,

It's fine for getting nervous. It won't to help you as you are losing time. To overcome this problem and gain your freedom you should practice more.

Practice will bring your confidence back. Make your weakness your strength. Why there is ambiguity. Everything needs to be crystal clear. Don't get confused. Stick to originality and trust your self. You have lots of things ahead. So just give your best.

Hope it helps!