As a PCB student planning to do B.Tech in biotechnology here are main entrance exams

1.JEE Main(for some colleges)

Physics, chemistry either Math or biology,some colleges accept Biology for biotechnology.many top colleges offering B.Tech biotechnology accept JEE Main scores but prefrence is often given to student with Math.

2.Common University Entrance Test (CUET UG)

With CUET it is possible to admission to Central universities like BHU ,DU which offer B.sc or B.Tech .

PCB students are eligible.

3.State level Entrance exam

MHT -CET (Maharashtra)

WBJEE( West Bengal)

KCET(Karanataka)

TS EAMCET /AP EAMCET (Telangana/Andhra Pradesh)

4.Private University Entrance exam - some private universities have their own entrance exam and accept PCB students.