B.Sc Maths

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Hi Vivek,
You can get admission in IIT by giving IIT JAM exam to pursue post graduation in IIT.
Good luck.

Yes, you can qualify the exam, but you have to wait for counseling mail.

Yes, you appear for this easily.
Good luck.

Refer to:
https://www.indiamart.com/bscmaths-coachingclass/services.html
You tube
Khan Academy classes online
Shiksha online
https://www.bachelorsportal.com/studies/53742/mathematics-and-its-learning.html.

B.Sc in statistics is having a very bright future. Considering all the fields starting from research, business field (E&P sector). Many companies need the business analysts. After completing your B.Sc in statistics, try to do M.Sc from ISI-Kolkata, Delhi or Bangalore. You will have a great journey for sure.

Here is a list of Universities offering M.Sc. Physics through distance learning:
Andhra University
Annamalai University
Alagappa University
Berhampur University
Bharathiar University
Bharathidasan University
Dr BR Ambedkar Open University
Madurai Kamaraj University
Madras University
Madhya Pradesh Bhoj Open University
Nalanda Open University
Nagarjuna University
Periyar University
Sri Venkateswara University
Manonmaniam Sundaranar University
Sri Krishnadevaraya University.

Yes. You are eligible to pursue B.Sc in Mathematics as you had Mathematics in Senior Secondary.

With this much percentage, you are not eligible for BSC mathematics in Delhi University. You require at least 75 to 80% in 12th.