Hello,

There are no such difficulties in doing B.Com. Don't worry, if you are a science student, you will be able to pursue the degree easily. The first few months might seem difficult at first since the subjects are entirely different but you will get the hang of it. Few of the subjects would be your language subjects which is should be okay for you, then there would be the commerce related subjects such as business studies which is easy to learn and accounting, should also be easy considering you have studied math before.

If you want you could study the 11th/12th commerce books or subjects which you are finding difficulty in so as to just get an idea of the basics. Other than that you just need to pay attention in class, clear your doubts in the beginning itself and work on topics that need your attention and you should be fine.

All the best!