What subjects should I choose in 11th if I want to do the IPM course in IIM Indore?

It should be Physics-chemistry-Maths-Computers if one wants to maximize their chances of selection and perform well in IPM.

Reasons:

The IPMAT has nearly IITJEE-level maths. The IPMAT consists of two sections: maths (quantitative aptitude and data interpretation, reasoning).

The first three years of IPM require at least nine courses in maths and statistics. Differential Calculus, Integral Calculus, Probability, Sampling Distribution & Statistical Inference, Linear Programming, Numerical Analysis, Optimisation, and other subjects are covered.

Furthermore, other computer-related courses are required. Object Oriented Design, Programming and JAVA, Data Analytics, Data Structure, C, Algorithms, DBMS, Web Development, and so on.

While there are ten courses linked to economics, practically all of them take a more mathematical approach. Except for 5-6 sessions out of 200, classes 11-12, economics is not particularly useful for those.

Why the commerce stream is ineffective - There is only one accounting course. Some management fundamentals and business law courses. While an accounting course may be preferable, I doubt it is difficult to learn. None of those other topics are covered in Commerce 11-12.

PCMC is typically present in 60% of the batch. Only 5% of 11-12 grade students have no math skills, owing to several diversity policies and affirmative actions. This track also aids in hedging one's prospects of admission to other institutions, including BITS Pilani's UG and integrated programs, IISER, ISI, and IITs.

While commerce in 11-12 assists in BBA, IPM is not the same as BBA+MBA, therefore please do not mistake it for that widespread and incorrect misconception.

P.S. - If you are weak in maths or dislike maths, you should avoid IPM at IIM Indore. Other IPMs and a variety of other institutes would be a better fit for you.