Hello,
You have done your graduation then you can go for specialization where you can take a domain from biotechnology as your interest. For that you have to appear GATE exam and score above 600 are accepted in top IITs. Try to perform your best in GATE so that you get a recognized institute for specialization. This will increase your value and open an easy for job opportunities. More of it knowledge and skills set is highly preferred during job selection. You can appear GATE 2021 and take admission in the same year for MTech.
Hope it helps!