A science background is often considered important because the path to becoming a commercial pilot involves several technical concepts. For example:
Understanding aerodynamics (lift drag thrust) and how aircraft perform in different conditions uses physics.
Navigation fuel calculation instrumentation all rely on mathematical reasoning.
Many aviation eligibility rules in India require completion of Physics and Mathematics in Class 12th. Thus having a science stream background gives students a smoother start in the theoretical part of pilot training.
The good news is yes it is still possible! Although many standard eligibility criteria state you need 10+2 with Physics & Maths, there are ways for students from non-science streams (arts/commerce) to make it work. Here's how:
If you didn't take Physics & Maths in school you can clear them later via open boards (for example National Institute of Open Schooling [NIOS]) as a private candidate.
Meet all other eligibility requirements for the Directorate General of Civil Aviation (DGCA) in India age limits medical fitness (Class 1/2) passing flying school entrance etc.
Be prepared for extra effort: you might need to work harder at the physics/maths parts since you didn't study them in your main stream but with discipline and focus it's achievable.
Stay updated: Note that rules are evolving. For example DGCA has proposed allowing students from arts/commerce streams for CPL if they meet certain conditions.
So yes you can become a commercial pilot without having chosen a science background initially. What matters most is achieving eligibility in key subjects (Physics & Maths) getting the required medical and training certifications and committing to the rigorous training. If your goal is to move from Can I Become a Commercial Pilot Without a Science Background to actually doing it plan accordingly put in focused study for the technical subjects and choose a DGCA approved flying school.