VIT Vellore

Vellore Institute of Technology (VIT) is an Institute of Eminence and a deemed university, situated in Vellore, Tamil Nadu. It was established by G. Viswanathan as Vellore Engineering College in 1984. The private institution offers 32 postgraduate, 43 undergraduate, three research and four integrated programmes. It consists of 16 schools and has three other campuses in Chennai, Amaravat and Bhopal. Over the years, the institution has made its place amongst the country's leading engineering colleges.

https://www.shiksha.com/university/vit-university-Vellore-institute-of-technology-29714/courses
Here you can click the link to get the full list of the courses offered by this college.

On the basis of Institutes profile, rankings and Placements statistics, the priority order is given below.
1. Vellore Institute of Technology
2. Manipal Institute of Technology
3. UPES
4. Maharaja Agrasen Institute of Technology, Delhi.

An aggregate of 70% or more in XII Std. considered eligible

An aggregate of 60% in PCM is required in your XII to be eligible for B.Tech Programme.

Admission to the B.Tech. Degree programme in VIT depends entirely on your score in the VITEEE. In case you are looking at non-engineering programmes, Yes. If you have an aggregate of 90%, you do stand fair chances of being selected through counselling.

The VITEEE level will be on par with other entrance exams for undergraduate programmes. Your choice of branch will depend on your score in the VITEEE.

You can apply through the general admission process offered by the VIT.
https://vit.ac.in/all-courses/ug

No, not at all, your age is acceptable for pursuing B.Com at VIT.

Master of Science in Integrated Biotechnology
It is geared to the model of sustainability and also develops concepts ensuring ecological and social compatibility. The duration of the course is two years and syllabus is divided into two semesters M.Sc. Biotechnology: As a minimum criterion of eligibility, aspiring candidates are needed to have attained a Bachelor's degree in any of Physics, Biological Sciences, BAMS, BHMS, BPT and any other related discipline, with a minimum aggregate score of 50%.