Hello aspirant,
Hope you are doing great. So the entrance exams for biotechnology are JMI entrance exam this is for Jamia Milia Islamia University, DUET entrance exam for admission into Delhi University, KCET entrance exam for Karnataka Universities and KIITEE entrance exam for Kalinga university.
So, in biotechnology in general maths is a necessary subject, however if you are choosing to do BSC in biotechnology then maths is not a subject in it.
Hope it helps you,
Good luck, Thank you.