U have done BSC graduate with Maths for CA.
U need to Clear CA entrance Exam.
It is for Next Exam Known As IPCC
for IPCC,  u need to Register with CA institute (ICAI)  for duration of 9 -15 Months with 100 hrs of training & Orientation Mandatory.
After Completing your IPCC (integrated Professional Competency Course)  , u had to Again register with ICAI for Final or Last for Duration of 3 - 3.5 years.
Between Final Attempt,  u need to Take or practice Articleship for 3-3.5 years.

Thanks & All the best,
Azim