Science

First of the all, basic maths is needed each and everywhere in life. And when coming to advanced maths like integration and all. They are mostly useful in CPT and somewhat in final. Being strong at maths is surely going to help you in costing and financial management as well as accounts.
Maths may not be as much needed when you pursue your CA course but once when you are done with CA and you want to join some field like investment banking, stock market, portfolio manager, financial analyst, etc., you will understand the dire importance of advanced maths. Many leave up maths in CPT thinking that the other subjects will set off it.
One thing I want to say to each and everyone pursuing CA, please do not study just to pass, do not mug up the concepts, understand them and practically apply them in life. You might fail once or twice in the exam (chances of which are also very less due to concepts being crystal clear), but you will never fail when you go out there in the cut-throat competitive world.
So, yes maths too is important, not that much but yes, it is.

Opting for commerce without maths is not a problem at all. You can easily pursue many courses like BBA which is Bachelors in business administration and MBA (Masters in business administration) and even CA.
Yes, of course, you need to take an entrance exam for some courses and maths will be there but the question will be related to basic mathematics like percentage, ratio and proportion, Time work, energy, etc.
So, no need to worry about the entrance exams as with little practice of basics maths topics, you can clear them easily and enrol for your desired course.
I would like to tell you that people very often confuse that maths in commerce is mandatory and one cannot excel without it, but it is a complete misconception. No doubt, it will help you grasp and learn many things fast but it is not compulsory to grow and succeed in commerce line. There are many options and lines in commerce which demand less of maths like CA and CS (company secretary), but the only advantage will be the calculation speed and accuracy. You can even go for MBA in finance at Master's degree level courses, generally, calculators are allowed and not to worry that much about calculation part at all.
So, just complete your course well with maths or without maths. It doesn't matter that much, what matters more is a good score and doing good in what you opt for. It is always important to go for the area in which you have interest rather than getting stuck with something in which you are not interested at all.