hi,

see the eligibility criteria is , an applicant must have

• a Bachelor’s degree (of at least 3-year duration) in any discipline and

• have passed the 12th standard examination with Mathematics as a subject.

now business mathematics or commercial mathematics is used in accounting courses where the mathematics which are related in science stream has calculus, integration, algebra, probability, differentiation etc. so business mathematics can not be equivalent with mathematics. you may follow the below link to know the syllabus,

https://www.isical.ac.in/~admission/IsiAdmission2017/Syllabus/MSQE_Syllabus-2018.pdf