Commerce

Please check with Symbiosis Skills and Open University as this is newly started so he has better chance to get admission there. Apart from this, he can do it from Pune University externally and also search for low profile or newly started colleges where chances are high.

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There isn't any relation among 12th marks and B.Com subject as you should also know it, then why are you thinking of so? If you have more marks in 12th you may repeat just like class improvement. Go through the subjects and your interest.

If you want to do CA, then I will suggest you to go for B.Com as it is related and you will find the similar subjects also. BBA is related to business administration. You will read about accounts, tax, finance, etc. in B.Com as well as in CA also.

Science will provide broader opportunities but it will be slightly tougher.

Go for science stream because it will give you an option to choose a variety of different courses after 12th, while if done Commerce you would stuck with just a few ones. Ask yourself what you want to do. If you have a plan then go for it else choose science.

This thread is only for management courses in SIES college. I'm extremely sorry to inform that I won't be able to answer this question as I do not have enough knowledge of the same.

Some commas there are many courses in commerce after 12th your option of B.Com, BBA, BCA and LLB but one thing is that you are not good in studies then you should take B.Com for graduation so that you can do regular studies it will be easy for you to score good marks.