Unfortunately, currently there is no system in place using which you can gain admission into a B.Tech course without taking Mathematics in your class XII exams. Since B.Tech or in general engineering is a very maths oriented field, it is required that you take maths in your class XII. So, being a PCB student, you can't take admission in any B.Tech or engineering degree.

But if you want to go into the biomedical field, I'll suggest you to do a B.Sc in biomedical sciences, which will quench your thirst for studying in this field. I'll suggest you to explore this option with an open mind.

Hope I have answered your question. All the best!