For any applied subject you must read the subject taking practical problems. For example you are studying about accounting and while you are studying it, deal with some problem through which you can understand how it can be helpful for a owner to keep accounts. This way you will not only make your examination results better but also will get a insight in the subjects. For subjects like Business Mathematics or Statistics, before knowing the application you must know what does the procedure mean. For example, in statistics or Mathematics you read about Standard Deviation. Then you must atfirst know that what does it signify and why it can be used for business data. This can be a optimal way to study. From a examination perspective, you must follow the previous year papers. Also to get some strategies you can talk with your professors or seniors who can provide you books which can be more rigorous specific to your university curriculum which can make your study easy.

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https://www.careers360.com/courses/b-com-bachelor-of-commerce

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