Computers & IT (Non-Engg)

Yes, you face difficulty in placement if companies visited your college. And If you placed then you will not get a decent salary with BCA Degree. Also, Growth is limited. In my opinion, BCA graduates have to do an MCA course then In this case 12th marks become secondary. They SEE the Academics score

No, I am sending you a link. Please read it. BCA stands for Bachelor in Computer Application
link-https://www.shiksha.com/bca-bachelor-of-computer-applications-chp.

I am sending you an authentic link from where you get a list of all good colleges for BCA in Bihar. Please check it out. link-https://www.shiksha.com/it-software/colleges/bca-colleges-Bihar?st[]=103&bc[]=33&ed[]=et_20&rf=filters&ct[]=171&uaf[]=city
But In my opinion, Any Colleges of Patna university

As much as I can understand your question, you are going to pursue 12th this year and apart from BCA, you want suggestions to pursue other courses.
Well I myself is a student of MAKAUT and pursuing BSC in Media Science.
There are plenty of courses to apply for, since your background is Biology, you ca

If your question is about training fee, then CCNA would cost approx 6k-8k and MCSE would be approx 9k-12k.
Now, if I will come to Global certification cost - The fee structure of cisco certifications has changed after the launch of GST (01-jul-2017) in India. Before GST, fee of CCNA R&S was 325 dolla

Some of the institutes you can refer are as follows:
NetworkNuts, South Extension, New Delhi
Linux World Pvt. Ltd. , Jaipur (Rajasthan)
CBitss Technologies in Chandigarh
Bagful Academy in Chandigarh
MIST PVT LTD in Hyderabad
COSS, Hyderabad
SYSADMIN ACADEMY in Chennai
UNNATI COMPUTERS Aurangabad, Maharashtr