No, Basic Mathematics in 10+2 is not eligible for becoming a commercial pilot in India.  To become a commercial pilot in India, you need Physics and Mathematics (Standard or Applied) as mandatory subjects in your 10+2 education.

NIOS (National Institute of Open Schooling) is a legitimate option to complete your missing subjects.Earning a Standard Mathematics (not Basic Maths) certificate from NIOS along with Physics would fulfill the eligibility criteria for commercial pilot training.

If feasible, consider re-appearing for your 10+2 exams with Physics and Maths as subjects.This might be a quicker option compared to NIOS.

https://school.careers360.com/exams/nios-class-12

I hope it helps!