Yes, you can very well do BCA after completing your 12th standard with Science stream (PCB).
Check College Websites Look for the admission notifications and application forms.
Entrance Exams Some colleges might have their own entrance exams for BCA admissions. Confirm the specific requirements of the colleges that interest you.
Direct Admission: Some colleges might offer direct admission based on your 12th-grade marks.
MHT-CET: You could also opt for appearing in Maharashtra Common Entrance Test (MHT-CET) to take the engineering and computer science courses, BCA among them.     Popular BCA Colleges in Maharashtra:

Symbiosis Institute of Computer Studies and Research (SICSR), Pune
Tilak Maharashtra Vidyapeeth, Pune
Maharashtra Institute of Technology (MIT), Pune
MIT World Peace University, Pune
Ness Wadia College of Commerce, Pune
Brihan Maharashtra College of Commerce (BMCC), Pune
Just verify all the eligibility criteria and admission processes of the colleges you want to consider.

Research: Research colleges and their BCA programs well to determine which one would suit your interests and career ambitions.
Prepare for Entrance Exams: In case entrance exams are required, prepare hard for them.
Track Deadlines: Keep track of all application and other document submission deadlines.
Go to the Counselor/Seniors: Get advice and guidance from a counselor or seniors.
Following all the steps with correct preparation, one can easily get enrolled in BCA programmes and get into a desired career path of computer applications. https://www.careers360.com/courses/bca-bachelor-of-computer-applications