CBSE

In which course he wants to take admission in?

Yes, you can easily apply in any college as you have passed class 12th.

No, there is no examination available for engineering now. You can give state level exam or you can switch to private university.

Dear Atul,
In response to your query, Can you confirm which branch you looking for?
To know about RIET, you may visit the website
http://www.rietjaipur.ac.in/

Hi there,
12th board marks are not considered in ComedK and as you have secured 105 marks in ComedK exam, you can get admission in BMS in core branches, but getting RV, Ramaiah & PES is not possible (you can even try your luck during the online counselling process).
Hope this helps.

No, you can't get BIT Durg. Apart from BIT Durg, you can get many colleges on your rank basis. If you want to know the list of colleges on the basis of your rank. then click on these videos and watch it till the last:
https://youtu.be/3YAzEP1vgvQ
https://youtu.be/hOlit6Un7l0
After watching the video, follow the steps as described in the video.

As compared to CBSE, NIOS is bit harder to learn. The NIOS text books has difficult words and Unknown new words. The answers are too long.

Yes, you may try. Visit this link to check B.Arch colleges based upon your rank:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=connect&utm_medium=CR_JEECP&utm_campaign=6919840
Then visit this link for various colleges which provides you brochure:
https://www.shiksha.com/architecture-planning/colleges/b-arch-colleges-india.