Hello,
Generally, to pursue postgraduate course in computer science engineering you need to pass B.E./B.Tech in or any other equivalent branches of engineering.
For specific eligibility and admission details you may contact the officials of the desired institute directly as such details differ from one course to another.
Please visit this link for more info
https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/gate-syllabus-for-biotechnology/amp&ved=2ahUKEwjb9ZGD8_jjAhVUT30KHWtACkoQFjAAegQIARAB&usg=AOvVaw28hzxFgsF0vD4D6E4WtFTE&ampcf=1

Hope it helps