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It depends upon what you are interested in. Every field has it's own importance and your salary depends on how you perform.
You can also go for professional courses like:
Hotel Management
Fashion Designing
Interior Designing
You can also go for many other courses. Being a science student you are eligible for many fields.
BA (Hons) in economics from a renowned college can also be a good option. After that, you can go for Master's degree or MBA.
After completing your Master's degree, you can also go for Ph.D for that particular course.
You can also apply for government exams.
You can opt for teaching as a profession.
Try to study in a top ranked college for good placements and high salary, but again every thing depends on your interest.
Do not aim for high salary package. Work hard and make your career in the field in which you have interest.

Hi, As you are interested in accounts you can go for MBA in Finance.
Finance: Financial is the backbone of any economy. Based on placement data from top colleges, it has been observed that Finance is one of the highest paying specialisations in India. Holding its position amongst the oldest existing specialisations, Finance is still a hot option amongst MBA students. Students choosing this specialisation are required to have a thorough understanding and information of financial world. Read more on Finance here.
Profiles offered-
Investment Banking AssociatesManagement ConsultantsTreasurersFinance OfficersAnalystEquity researcherCredit ManagersJobs related to the capital marketJobs in banking sector Jobs in finance department of companies.
Top colleges- IIM Ahmedabad, IIM Calcutta, Indian School of Business, IIM Lucknow, IIM Bangalore, Faculty of Management Studies (FMS), Xavier Labour Relations Institute (XLRI), Indian Institute of Management (IIM) Kozhikode, S. P. Jain Institute of Management and Research, Indian Institute of Technology Bombay (IIT Bombay), Indian Institute of Management (IIM) Indore, National Institute of Industrial Engineering (NITIE), Mumbai and many more.
Top recruiters- HDFC Bank, ICICI Bank, Axis Bank, Genpact (GECIS), Deutsche Bank, Infosys Technologies, Kotak Mahindra Bank, Cognizant Technologies Solutions, Accenture Services, Deloitte Touche Tohmatsu, Tata Consultancy Services (TCS), Thomson Reuters, Royal Bank of Scotland (RBS).
https://www.shiksha.com/mba/articles/know-the-top-10-mba-finance-colleges-in-india-blogId-7018

I haven't attended IISER entrance exam. But I can let you know what my friends who wrote and got admitted to IISER have told me.
A first and most important thing you should have cleared DST-INSPIRE cutoff, which is different for different boards.
Exam is not going to very tough but may be bit tricky or challenging. So, focus on basics. First start solving some selected problems from NCERT textbook, which are bit tricky or those one which you did not now solve in your first or second attempt. Then go for previous year IIT JEE (now JEE Advanced) and AIEEE (now JEE main) papers. This much will do well.
Give effort to make your very basic Understanding of +2 science and mathematics diaphanous. IISER doesn't test your knowledge, it examines your rationality.
Examination conducted by IISER is somewhere intermediate between JEE main and JEE Advanced. So prepare yourself and start as early as possible. You can also take help from YouTube. Cingage books will be good for your preparation. HC Verma should be your first choice.
All the best