CBSE 12th

You should apply for a Diploma course in Distance mode. The minimum academic criteria to pursue Diploma course is that the candidate must have passed class 10 examination or its equivalent examination from a recognised board of education. To pursue Diploma course through distance mode one has only few colleges. Also the candidate must have to meet the age criteria. You can apply to the universities mentioned below:
Indira Gandhi National Open University
Osmania University
Annamalai University
Symbiosis MBA through Correspondance
Sikkim Manipal Distance Learning programmes
Mumbai University - IT courses through Distance Education. Jain Vishva Bharati Institute
Kotak Open University
Regards.

Yes, you are eligible to pursue Diploma in Aviation, Hospitality and Travel Tourism Management from Institute of Logistics and Aviation Management, Mumbai.
Basic eligibility for this course is that candidate should have cleared their class 12 exams with minimum pass mark of 50%. If needed, candidate have to clear the ILAM entrance test. Admissions are made on the basis of personal interview. Please download college brochure from the link provided below for further information. Regards.
https://www.shiksha.com/aviation/course/diploma-in-aviation-hospitality-and-travel-tourism-management-institute-of-logistics-and-aviation-management-mumbai-andheri-east-265816

Scope of Biotechnology for B.Tech students:
Any student who is contemplating on pursuing a career in Biotechnology must be aware that this field is still developing in India. Therefore, the number of job openings and pay packages are both very low when compared with IT and CS fields. After a B.Tech degree, students can find jobs in pharmaceutical companies, research labs and institutions in India. Since this field is highly research oriented, vast and diverse, it is highly recommended that students pursue their graduate studies in Biotechnology, Biomedical sciences, Biological sciences, Bio-process Engineering etc. Scope of Biotechnology for B.Sc. Students:
If you are a B.Sc. Student in biotechnology or any other biological sciences related fields, it is highly recommended that you pursue your M.Sc. The job opportunities for B.Sc. Graduates in a highly research oriented field as biotechnology is very less and most students tend to pursue their M.Sc. In Biotechnology or a specialised discipline of biotechnology. India is home to some excellent M.Sc. Programs such as JNU, DU, IISc, TIFR, IITs etc. With an M.Sc. Degree, most students tend to work in research labs and industries as research assistants. The pay package is also quite less for M.Sc. Graduates. Since India is still developing, it is highly recommended that you do your M.Sc. In a reputed institution for good campus placements and job opportunities. Regards.

Hi Vihaan, A very good question, you will be relieved to know that you can apply without your final class 12th marks. Instead of your class 12th board marks, you are supposed to submit predicted scores, usually submitted by the teachers. You are advised to visit the common app portal to know the application requirements to get an idea and if you have any doubt you can drop them an email or contact the university directly. On the basis of your predicted score, you may get an offer which will be conditional. I will advise you get these clarified with the universities before applying. Here is the common app portal:
http://www.commonapp.org/.