Mathematics is a subject that is divided in two parts. The first part is Mathematics that will develop the mathematical aptitude of the person. The second part is deals with the statistical analytical tools and commercial mathematics. This is an optional subject for Students of Commerce. The option available is Secretarial Practice.
All chapters in Mathematics and Statistics of 11th are just the continuation of Maths that the was learnt in 9th and 10th with a special focus on chapters related to commercial.
Taking maths will give an upper edge to Students planning to do CA, CFA, MCA, Accounts, Finance, Economics, Data Analysis, etc.