You are a student of commerce halfway through your first year and now find the science books interesting. Is this just like an infatuation or a case of the grass is greener on the opposite side.
Please don't give up a year just because you find science books interesting.Give it some more time and at least finish this year, hopefully, you can move on with commerce as your main study and science as a hobby.
I'm glad to see your achievement of 87% in the first semester. With commerce, you have excellent opportunities to become a company secretary (CS), accountant, finance expert, manager or analyst or a chartered account.
Please don't be in a rush. Meet the teachers of commerce and science and have a discussion, spend some time so that your aptitude, interests, and ability to perform well and the realistic chance of having a good career go into making an informed decision, rather than just interest in some books.