Dear Aspirant, one can pursue B.Sc as well as B.Tech in Biotechnology, Bio engineering. Various entrance exams like JEE Mains, JEE Advanced, BITSAT, SRMJEE,VITEEE are there that one can apply for in 12th standard , these exams are for admission into various colleges offering B.Tech  as well as B.Sc in biotechnology, Bioengineering. You can get to know more about biotechnology here:

https://www.careers360.com/courses/biotechnology-course

Also you could check out more about these exams, you'll get to know about syllabus & more  -

https://engineering.careers360.com/exams/jee-main

https://engineering.careers360.com/exams/jee-advanced

https://www.careers360.com/exams/bitsat

Dear Aspirant,

to pursue the subject or course of Biotechnology after your completion of 12th standard, you will first need to an under graduation degree. The under graduation degree can be technical which would be BE/BTech in Biotechnology, which is a professional course or you may also do BSc. in Biotechnology as per your preference and convenience. The course of BE/BTech is for a duration of four years whereas the BSc. course is for a duration of three years.

To pursue either of these courses you are required to be a part of the science stream in your 12th standard and have subjects such as Physics, Chemistry and Mathematics.