Science

There is always a good hidden thing that seems left as options. We wish you get through the NDA. In case, you don't, Mass Media can be a good option and is indeed a growing domain for those who develop themselves as skilled mass media learners.

I am referring an answer already given to a similar type of question. Checkout this answer on shiksha:
https://ask.shiksha.com/bca-is-best-or-bsc-in-mathematics-and-what-is-career-in-bsc-mathematics-qna-4070336?referenceEntityId=4070358

BCA is about computers and B.Sc is a science/maths area that you already know. If you want to go for a job related to computers like development or hardware, this is the field for you. Still, to get good jobs after BCA, you will need to go for higher studies like MCA. Same with B.Sc though but doing a B.Ed after B.Sc maths can make you eligible for a teaching job with government as well.

You should prepare for civil services or for Indian Forest Services exam. All the best!

Not cracking JEE Mains is not the end of the road. You still have following options available with you:
(a) Engineering from state or private colleges
(b) BCA
(c) B.Sc IT/CS
(d) B.Sc Physics, Chemistry, Maths or Statistics
(e) B.Arch
f) BBA, BMS, BBE, etc.
(g) Five-year integrated law
(h) NDA
(I) SCRA
(j) Merchant Navy
(k) Fashion Designing
(l) Hotel Management
You can also change your stream to commerce, economics, humanities, etc. You may choose any based on your interest to excel in the professional career. BCA may be a better option in comparison to generic B.Sc.

Hi Kartik,
Renin is the enzyme that converts the plasma protein angiotensinogen to angiotensin.
All the best.

Jhunjhunwala and SIES are the good options for you.