IIT

Don't go on assumptions, just match with the answer key and if right then prepare for JEE Advanced because previous year's cut-off for SC category is 52.

No, without clearing these entrance exams, you are not eligible for any government colleges according to the new education policy.

Yes, you can but before that you will have to crack JEE Mains and then JEE Advance.

Hello Mohit,
If you have not appeared for JEE Mains then IIT and many CGFI including NITs are out of the way. If your state is accepting JEE Mains score then that too is gone. I think your best chance is with few of the private colleges which admit students based on their own CET.

B.Tech from IITs is best after 12th from Science stream.

From this year, class 12th marks will not be considered for JEE Mains. You may get NIT of North-East states but I would advice you to rather keep preparing for JEE Advance from now itself.

Hi,
You may refer to following article for tips on cracking JEE:
https://www.shiksha.com/b-tech/articles/10-tips-towards-your-jee-mains-advanced-preparation-blogId-11721

Hello Himanshu Raj Gupta,
The first and the main thing to clear IIT exam is you should learn all basics of Physics, Chemistry and Maths deeply.
Try to understand each and every step so that you can solve any equation and maths problems.
Stick on NCERT Books as they are the best for preparation.