Hello,
Yes you can opt for b.tech in biomedical engineering after your class 12 with biology.
The minimum eligibility criteria is that the students must have passed their class 12 boards with biology and maths with aggregate in all of 50%
Some of the top Engineering colleges in India offering b.tech biomedical engineering are

• MIT, Karnataka
• SRM, Chennai
• Pondicherry Engineering college, Pondicherry
• Bharti Vidyapeeth University, Maharashtra
• Rama University, UP

The course is a mixture of design and problem-solving skills that come from engineering and expertise of medical and biological sciences for a revolution in medical industry.
hope it helps

Hello there,
For doing B.Tech, you need to have maths. In all the engineering colleges, admission is done through entrance exams, generally JEE Main, or any other state level exam. To be eligible for these engineering exams, you should have Mathematics in your 10+2 level. If you had PCM or PCMB subject combination, then you can appear for these exams, and can also apply for B.Tech Biomedical Engineering. There are many good colleges offering this course.
Hope this answer helps you.
Good luck!!