CBSE 12th

Hi, You don't need Biotechnology in your 12th and you can pursue Biotechnology if you had PCM.
You can go for Biotechnology from best universities in India: Shoolini University.
Biotechnology is an interdisciplinary Science integrating biological sciences with engineering sciences, pharmaceutical sciences, mathematics, chemistry and physics. Biotechnology has applications in diverse fields such as medicine, agriculture, food technology, pharmaceuticals, diagnostics, blood products, artificial organs, nutraceuticals, energy, pollution control, environmental protection and waste management. Eligibility
10 + 2 (PCM/ PCB); Lateral entry to 3rd Semester for Diploma holders in concerned or related subjects with minimum 55% marks. Duration: 8 semesters
The basis of Admission: Through JEE/ AIPMT/ HPCET or any equivalent entrance test recognised by HP Government. For more information, you can visit:http://shooliniuniversity.com/programme/biotechnology/btech.

B.Sc in nutrition and dietetics: Admission Process:
Admission to the course at some colleges and institutes offering B.Sc in nutrition and dietetics is based on the candidate's performance in the relevant entrance examination conducted by the concerned university. Admission to the course at some other colleges/ institutes, however, is based on the candidates scores in the qualifying exam, I. e. classes X and XII. Subsequently, a merit list is prepared, based on which seats are allotted to the shortlisted candidates. Please refer to the link provided below for a list of B.Sc. Entrance exam conducted by various institutions and authorities across the countries:
https://www.shiksha.com/science/articles/top-bsc-msc-entrance-exams-in-india-blogId-13484.