CBSE 10th

It varies from institute to institute. You can visit Shiksha's website for the nearest coaching institute.

Diploma can't get in NIT.

Admit card of class 10th is not required for admission to B.Ed but the certificate is compulsory, so is class 12th certificate.

You have to clear the qualifying exam which is class 12th boards before applying for the UG program.

This depends on your interest and on where you can get admission based on your percentage. Answering an aptitude test for this might help you make your choice. Do a search for aptitude test centers with counselling near you or you could try out an online aptitude test but you will not get any counselling regarding the aptitude test results then.

No, first you have to pass class 12th exam. Then only, you will eligible for this.

Yes, this certificate will be useful in taking admission bin AUCET. You can use your A certificate.

Yes, but they have special seat allotment.
https://www.shiksha.com/university/Andhra-university-Visakhapatnam/aucet-exam-counselling
Check out this link for more information.

Hello Abdul, If you like to choose any stream related to Science, you have to go for PCM or PCB (P-physics, C- chemistry, B-Biology, M-mathematics) after completing 10th. Once you have chosen and completed 10+2 classes, you can choose B.Sc. Or B tech courses related to Science according to your interest.