Mathematics

Yes, you can apply for M.Sc Mathematics.

Eligibility for M.Sc in Astronomy:
*The minimum eligibility required to be met for admission to the course is B.Sc or an equivalent degree with a minimum aggregate score of 50%.
*A few universities and colleges in India conduct entrance examinations for admission to the course.
Good luck.

https://onlineadmission.ignou.ac.in/admission/StudentRegistration.aspx
Click the link given above to apply for M.Sc in IGNOU.
Good luck.

Hi Arnab,
No, there will be no disadvantage. If we talk about Maths, it is not an easy sub for PhD. You will have an advantage over others that you have core knowledge of B.Tech, and this can help you in the research work after PhD.

Hello Chidanand,
Yes, you're eligible for NET. You need to face mathematics paper 1&2 with statistics as subject.
All the best for your future.

Mathematician - You can choose to pursue research (become a scientist) in your area of interest in maths and if you choose research, you can go into the teaching sector also. Check out institutes like TIFR-Mumbai, IMSc-Chennai, Harish Chandra Research Institute-Allahabad.
Chartered Accountancy - If y

No, the cutoff for Fergusson is quite high.

As per my knowledge, you are eligible.

Admission is done through counselling based on the marks obtained in the entrance test conducted by the Maharshi Dayanand University, it's not based on merit.
For more details, check the link below:
https://www.shiksha.com/science/course/integrated-b-sc-hons-m-sc-hons-in-mathematics-maharshi-dayanan