Hey,
The Bachelor of Science(B.Sc) in computer Science is a three year long undergraduate programme.
The basic eligibility criteria is to pass 12th with science stream from a recognized board. So,you can pursue B.Sc in Computer Science.
There are other streams as well where you can apply. Since you are from PCB stream,so you can go for medical related fields. You may go for normal graduation in any stream of your choicr provided you meet the eligibility criteria. Some colleges offer admission based on your marks scored in 12th or through their respective entrance exams. You may go for Law related fields.
So, be sure of your calling and work accordingly.
Hope this helps.
Good luck.