Hello students. Basically there are 3 streams, mpc that is maths and major, bipc that is biology as major, mbipc, maths and biology as majors. Here you will be studying both the subjects

So in answer to your question, yes you are eligible to attend anna university counseling in engineering stream

But they would consider your score in maths  physics and chemistry because that is engineering stream and had nothing to do with biology.

The point of bio maths is itself to attend for both the sides counseling,  as in biology side that's through neet and maths side that's is engineering