Yeah! You can take admission in BCOM course after Science. But it can be a paradigm shift for you. Science attempts in a very distinct way. So if you have a scientific and if you are enthusiastic about science then commerce will not satisfy you. But if you wish to change the subject then you can thats for sure but for that you have to learn the basic fundamentals of the subject such as accountancy, Balance sheet construction, Economics and other Commerce portions. Without this fundamentals it can be hard for you to coup up. Oftenly we think commerce as a applied part of mathematics which have only addition, multiplication and basic operations. But this isn't entirely true. They may not have to use calculus like science grads but they have there own challenges in there field and to get accustomed to this field one have to know the fundamentals of commerce and only math won't suffice.

To know more about Commerce visit the link below:

https://www.careers360.com/courses/commerce-course

I hope this answer helps. All the very best for your future endeavors!