Questions and lots of questions.

I'm currently in 11th in jr college and I'm thinking of switching to NIOS because of Mental health.

I have lots of questions so I will ask them

1. Can I take admission right now, if yes, do u think I should take it right now or later. (Let me know the date)

2. What are blocks and streams, please let me know

3. How will the examinations work aswell as the practicals and their dates

4. Is there anything important I should know about this.