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Hi Gulshan,
Chartered accountancy is a professional degree course which offers huge scope for the aspirants. After becoming a CA a person can choose to either be employed with a firm as an employee or they can choose to open their own private practice. You can refer to the below links to find all the information about CA course and profession:
https://www.shiksha.com/accounting-commerce/accounting/articles/ca-cpt-stepping-stone-to-becoming-a-ca-blogId-4869
https://www.shiksha.com/accounting-commerce/accounting/articles/career-in-chartered-accountancy-a-repository-of-opportunities-blogId-3595
https://www.shiksha.com/accounting-commerce/accounting/articles/ca-final-may-2016-topper-shri-ram-shares-prep-strategy-blogId-13020.

Job prospects for structural engineers:
Out of the various branches of civil engineering, structural engineering is the most common and applied one in day to day life. As most of the construction works require the service of structural engineers, demand and scope for these engineers are much more than any other engineering field except maybe for software engineers.
Structural engineers often specialize in particular areas, such as engineering of bridges, buildings, pipelines, industrial structures or special mechanical structures such as vehicles, ships or aircraft. Structural engineers perform one of the most important roles in the construction industry. Without their skills and technical knowledge the structure we built will not be able to withstand weight, pressure and seismic activity. Structural Engineers also play a role in designing machinery where structural integration of the item is a matter of safety e.g. aircraft, spacecraft.
Structural engineers can find employment in a wide variety of venues, particularly firms specializing in architectural, engineering, construction and related services, as well as state and local governments. Many structural engineers hold supervisory or administrative positions. Another option is to work as a self-employed contract engineer or as consultants. Yet others who don't like site work can opt for research or teaching positions in universities. Regards.

There is an immense scope in streams like commerce, accounting, economics and arts. But choosing commerce over mathematics is good and the best option for only a shorter period of time till you complete your intermediate, after that, you will be facing a little problem in undergraduate wherein you will be dealing with accounting- corporate, financial, managerial, cost, audit and taxation as well. The above disciplines include calculation of functions relating to mathematics. So if you are good in mathematics and want a short break from it to get an exposure of civilization, history and archaeology, you can opt the field except for mathematics.