Maths Spl

Yes, you can definitely apply for and pursue CS and B.Com even if you haven't studied maths in your class 12th. Maths is not a compulsion for CS and B.Com.

Since you have done B.Sc in Maths, so your field must be related to mathematics, which can differ after opting masters in IT. So, that can be a problem for you in future to cope up with the subjects. Along with this, if you are having graduation in Math, so it will be difficult for getting job somehow.

There are many courses in which one can go for. It can be BBA, B.Com, CS, CA, BA. Career in animation is also an option, hotel management, event management, Foreign Languages, etc.

SCIT provides MBA in ITBM, MBA in DSDA, Executive MBA program and PGP-ITBM. MBA-ITBM course offers a variety of specializations that will be beneficial in the IT industry. You need to be a Graduate of any faculty of any Statutory University with 50% marks at graduation level to qualify for admissions in SCIT.
All the best!

Yes, you definitely can. There are three pathways to appear in IISER exam I. e. Either through KVPY or JEE or SCB. Since you have dropped mathematics you can either go through KVPY or SCB. So, check your SCB according to your state and then you can apply if you qualify the cut-off marks.
All the best!

According to my point of view, Mechanical Engineering and Computer Science Engineering are the best for mathematics brilliant students. I would suggest you Mechanical Engineering with recognised colleges. If you belong to Punjab you can choose RIMT University in Punjab for this course. http://rimt.ac.in/school-of-engineering.php.

Do engineering or B.Sc. In physics. .

yes . . He can apply for bsc .

Both are good options. You can choose any one of them as per your interest. You are eligible for both as you have scored more than 60% marks. But be careful with your decision as both are different lines.

Yes, you can apply. You just have the clear the entrance exam.