You are eligible to do B. tech (biotechnology) from all the govt institution except IITs and NITs as you have done your 12th from PCB , so ,you are not eligible to appear in IIT entrance examination ..Apart from those (IITs and NITs) you can do you BTECH.

for further information you can check out this link as given below:

https://dqxeclau.top/question-how-can-a-pcb-student-join-btech-bioinformatics#:~:text=Yes%2C%20A%20PCB%20student%20can,optional%20subject%20in%2010%2B2.

Hope you understand , in case of any issue you can comment here and also make a new query for the same.

Thank you and all the best.