Science

Hi Pavithra,
Starting salary depends on factors like ones qualifications, job profile, profile of the employer and job location. Depending upon the above mentioned factors, a nutritionist or dietitian could earn anywhere between 10-20k Rupees per month (at start). After gaining work experience, this figure will increase. In case of Government job, the salary will be based on the pay band and scale.
All the best.

I am also a class 12th student seeking for admission and I also got 81%. I think our destination is same.
I think we should wait for the DU cut-off, maybe in some courses like life sciences, we will get admission. Otherwise, we can find out some good private universities.

As you have chosen non.medical in your +2 class, I suggest you to concentrate more on these three subjects and less on others. This will make your base for further studies. Revise the things side by side at home along with school. Prefer self study rather than throwing money in institutes. Do google and use YouTube for clearing doubts.

Here are some of the subjects which will be there in B.Sc course for the bio candidates:
Physics
Chemistry
Electronics
Statistics
Botany
Zoology
Biotechnology
Microbiology
Genetics

For this, +2 with non.medical is required. So, go for it after passing the class 10th. Focus more on PCM as this will be your base for B.Tech in astrophysics.