NIOS 12th

You will be requiring your 11th grade marksheet.

Yes, you can apply for B.Ed if you have completed your graduation.

Refer the following:
Nagarjuna University, Guntur. Sri Satya Sai Institute of Higher Learning (Deemed University), Prasanthinilayam, Anantpur. Andhra University, waltair. Osmania University, Hyderabad. Sri Venkateswara University, Tirupati.

Hi, Tap on the below link to know about admission eligibility in TIFR. As per my knowledge you can't get admission in TIFR on the basis of 12th Marks. https://www.shiksha.com/university/tifr-tata-institute-of-fundamental-research-mumbai-1239/admission.

Yes.

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Hi Vaibhav! If you properly invest your some time in studying Maths especially the syllabus of NIOS Maths then it will not be that hard for you to pass the exam. Just keep in mind, NIOS question papers aren't that hard, but Copies are checked very strictly So, try to Study Maths from a book of a good author which can clear all your concept easily and enhance your thinking skills so that you can solve your questions easily. All the Best for your Exam!

Yes they consider them.