Hello,

First of all, don't worry. You still have a chance to switch your lines even though you have Bio. There are some private engineering colleges that still provide admission to PCB students. Hunt for those colleges and keep your keen interest in these fields. Moreover, you really need to get a hold on to Maths and all its core concepts that you may have missed as maths is really important for pursuing career in these tech fields.

I hope this helps, All the Best!